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The most accurate, practical and direct way to find out would be to use a stopwatch on the actual system. I found that we could go from about 60 psi to 110 psi in about 10-15 s (a timing loop in PBASIC was used), using a single small reservoir, 2 yrs ago, but longer with both reservoirs last year, using the high- and low- pressure switch pair.
Sometimes it took lomger - especially with a leaky actuator we had, that would pass air around the piston if it were not fully open or fully closed.
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