Though... if you have the one bay open... once that disk is added to the pool, you should have enough free space to move data out of 3-4 of the 1TB drives at once. i'd recommend using the "File Placement Limiter" balancer to clear the other 1TB disks (by opening that balancers settings and unchecking both "duplicated" and "unduplicated"' options for the disks in question). This will clear out the disks as well, making it super quick to remove the drives.
As for how long, that dependds on the system, but probably a few hours at least per disk... unless you use the balancer method I recommended (well, it will take that long or longer to remove the disks... but you can let that run overnight so the actual removal process is seconds)
hi! i have a Sans Digital TR8U+ JBOD tower with 5 3TB HDDs USB3.0, it's posible that i can mount a pool with stablebit drivepool with those drives? what about if i like to turn off the JBOD tower when i don't need to use any of the files in that pool, do i have to do any steps or is that posible? the pc with stablebit pooldrive will remain on after turning off the JBOD tower. thanks!