I never leave anything running when I'm not in the train room. It doesn't take my stuff that long to boot up, I think the MTH WIU is the last thing that is on-line for use. The TIU and Legacy command base are up in a few seconds. The Lionel WiFi is up in around 15-20 seconds. The MTH WIU seems to take the longest, but I only use it occasionally as I still prefer the plain old remote.