Why it works

Mechanism	A part can come out once its thickest wall is stiff enough to keep its shape. Each second the mold stays shut after that makes nothing. A shorter timer ends each cycle sooner, so the same job needs fewer press hours.
Math	The five longest-running jobs ran about 18,000 press hours in twelve months, at an average cycle of 30 seconds. One second off each cycle frees about 600 of those hours. We assume orders fill 70 percent of them, 420 hours, and each filled hour earns $55: about $23,100 per year. The trials cost about $2,100 once: five jobs at about 8 hours each of a process technician, at $52 an hour. That pays back in about 1 month.
Industry evidence	In published cases of shorter molding cycles, cooling is often 60 to 80 percent of the cycle. Molding handbooks give a standard formula: the cooling time a part needs rises with the square of its thickest wall. So each timer can be checked against its part. No published figure gives the spare time in cooling timers, so the seconds here are our estimate.
Limitations	A freed press hour earns money only if an order fills it. A round number is only a sign, so some timers may already be right. A timer cut too far lets a part warp after it leaves the press, so each step is checked on cold parts. A part whose process a customer approved waits for the customer's sign-off, which can take four to twelve weeks. And where the press needs that time to melt plastic for the next shot, a shorter timer saves nothing.

Illustrative sample. The plant, the walk and the footage are synthetic. Figures from our analysis are estimates made with AI, not guarantees.