Defining Cycle Time
Cycle time in collision repair is the total calendar time from vehicle arrival to vehicle delivery. It includes every hour the vehicle is in the shop — active repair time, waiting time, and idle time between operations. A repair estimated at 20 labor hours that takes 7 calendar days has a cycle time of 7 days. The same 20 hours completed in 4 days has a cycle time of 4 days. The labor content is identical — the difference is how much non-productive time exists between productive operations.
Industry benchmarks for average cycle time vary by market, repair complexity, and shop volume. DRP (direct repair program) shops typically target 4–7 days average cycle time. High-performing shops achieve 3–5 days. Shops without cycle time focus commonly run 8–12 days. Every day beyond the optimal cycle time represents a day the vehicle isn't earning revenue for the shop and a day the customer doesn't have their car.
Key Metrics to Track
Keys-to-Keys Cycle Time
Calendar days from the day the customer drops off the keys to the day they pick them up. This is the primary metric — it's what the customer experiences and what insurers measure. Track it for every repair and calculate the monthly average.
Touch Time Ratio
The ratio of actual labor hours to available calendar hours. If a repair has 20 labor hours and the vehicle is in the shop for 5 business days (40 available hours at 8 hours per day), the touch time ratio is 20/40 = 50%. A higher ratio means less idle time. Top-performing shops achieve 65–80% touch time ratios. Below 50% means more than half the available time is non-productive.
Supplement Ratio
The percentage of repairs that require supplemental estimates after initial tear-down. High supplement ratios (above 40%) indicate that initial estimates are incomplete — the tear-down reveals hidden damage that wasn't captured during the initial inspection. Each supplement adds 1–3 days of cycle time waiting for approval and parts. Improving initial estimate accuracy (thorough visual inspection, standardized tear-down procedures) reduces supplement frequency and the cycle time it adds.
Parts Delay Days
The average number of days a vehicle waits for parts before work can begin or resume. Track the date parts are ordered and the date they arrive. The gap is parts delay time. High parts delay (above 2 days average) points to either ordering delays (parts not ordered promptly after tear-down) or supply chain delays (parts not available from the supplier). The fix depends on the cause: ordering discipline for the former, supplier relationship management for the latter.
Booth Utilization
The number of paint cycles per booth per day. A booth that runs 3 cycles per day is underutilized. A booth running 6–8 cycles per day is at high utilization. Low booth utilization is often the cycle time bottleneck — vehicles wait for booth availability while the booth sits idle between loads because the next vehicle isn't prepped and ready.
Collecting Data
Track cycle time data in your shop management system (CCC, Mitchell, Audatex, or a standalone tracking tool). At minimum, record for every repair: date vehicle arrived, date tear-down completed, date parts ordered, date all parts received, dates of each major operation (body work start/finish, prep start/finish, paint date, assembly start/finish, detail/delivery), and total labor hours clocked. This data takes 2 minutes per vehicle to enter and produces the monthly metrics that drive improvement.
If a digital system isn't available, a physical production board with vehicle cards that move through stage columns (tear-down → parts → body → prep → paint → assembly → detail → delivery) provides visual tracking. Each card shows the vehicle's arrival date, target delivery date, and current status. The board makes cycle time visible to everyone in the shop — when a card sits in the "waiting for parts" column for 4 days, the delay is visible to management, the parts department, and every tech who walks past the board.
Identifying Bottlenecks
A bottleneck is the stage in the repair process that constrains throughput — every vehicle must wait at the bottleneck stage because it can't process vehicles as fast as the stages before it deliver them. Common bottlenecks in collision shops:
Spray booth: The most common bottleneck. If the shop can prep 6 vehicles per day but the booth can only paint 4, two vehicles wait overnight for tomorrow's booth schedule. Solution: increase booth utilization (prep ahead, mask outside the booth, reduce changeover time between loads), add a second booth, or extend booth operating hours.
Parts supply: If parts take 3–5 days to arrive and body work can't begin until parts are on hand, every vehicle waits 3–5 days doing nothing. Solution: order parts earlier (at initial estimate or within 24 hours of tear-down), use partial repair strategies (begin body work on undamaged sections while waiting for parts), or identify parts supply alternatives (local salvage, aftermarket, dealer stock check before ordering).
Technician capacity: If the shop has more vehicles than technicians can process simultaneously, vehicles queue at the body or prep stage. Solution: hire additional technicians, improve technician efficiency through training and tooling, or schedule vehicle intake to match technician capacity (don't accept 10 vehicles in a week when your body department can process 7).
Improvement Strategies
Pre-order parts before tear-down: Using photo-based AI estimating or thorough visual inspection, order visible parts before the full tear-down reveals hidden damage. Parts are in transit while the vehicle waits for tear-down scheduling. When tear-down reveals additional damage, supplement and order additional parts — but the visible parts are already on their way.
Dedicated prep team: Assign specific technicians to prep work (masking, scuffing, tack-ragging) whose job is to have the next vehicle prepped and waiting outside the booth door when the current load exits. Zero booth idle time between paint cycles maximizes booth utilization — the highest-cost-per-minute resource in the shop.
Morning production meetings: A daily 10-minute meeting where the production manager reviews: which vehicles are scheduled for which operations today, which vehicles have blockers (parts not arrived, supplement not approved, sublet not returned), and what the booth schedule is. This meeting identifies and resolves blockers before they waste a full day of calendar time.
Parallel operations: While waiting for parts on one area of the vehicle, begin body work on undamaged sections, prep adjacent panels, or complete assembly of components that are ready. Parallel operations convert waiting time into productive time. This requires planning — knowing which operations can proceed without the missing parts and which must wait.
Track and review monthly: Calculate keys-to-keys average, touch time ratio, parts delay days, supplement ratio, and booth utilization at the end of every month. Compare to the previous month and to your target benchmarks. If cycle time improved, identify what changed and sustain it. If it degraded, identify the cause and correct it. Consistent monthly review creates a cycle of continuous improvement that compounds over time.
Back to Pro Tips
