Creality Space Pi filament dryer - auto off?

When the temperature reaches the values specified for a given filament, does the dryer shut off? I was allowed 4 to 8 hrs, I chose 6 but the PV was equal to the SV in less than an hour and the humidity is 15%. I don’t plan on printing for a few days, do I let it run for another 4 hrs or turn it off now then when ready to print turn it on a couple hours ahead of time?

keep it running the air is 15% but not the filament yet. You need 6 hours at least.