I do "The Aunt Jemima Treatment" twice a year with 303 protectant (bottle with Green Label) twice a year. Be generous with it, 1/4 bottle applied in first coat, 1/4 bottle in second coat - and again, repeat this every six months for a car that sits outside a lot OR is driven daily.
Saturate the crap outta the seam around the window and release the top from the windsheild frame and apply it to all seams and ridges - leave no exposed fabric untreated, then close up the top as pictured and let it sit in the warmest sun for a few hours to dry. (No need to fear the sun while drying as with wax, 303 even tells you to do it this way.)
As to the time it takes, I'll get my car out and time it today for you and report back - but I'm rather sure you are fine. I want to say 25 seconds for the motor/pump to complete an up or down cycle.
Again, I'll check. As Walter Lewin (famous physics instructor at MIT for a generation) would say,
"Any observation or measurement, without knowledge of the accuracy, is meaningless". Do not trust your human perception. I was convinced my CPAP was not pressurizing properly. Two minutes with a metric ruler and a pail of water proved to me that my CPAP is fine.
And we say "Fabric Top" 'round these parts. Canvas is for tents and dead bodies. We are a very formal and proper
culture.