the timer for maintenance is in the work queue, and it should be coming soon as we have a much prior task that we're working on FLUX-app, which you can use on your mobile device. This will allow users to view, control and print tasks (that's already printed or uploaded to the device).
I understand your pain as we do occasionally encounter this problem. We do have a task for that too, which is to allow users to use USB, sending task directly instead of Wifi.
when you mean print time is double, do you mean the estimated time or the actual print time? does any other user encounter this problem?