Just got a Minimad a few months ago, and I've noticed that it stops working after a few days or weeks, requiring me to unplug it from power and plug it back in, and startup time seems to be around 40-50 seconds.
This is for DMX ArtNet playback, with a micromodul8 connected to it. The sequence lights on the micromodul8 remain lit, but the ArtNet output ceases after a period of time. I'm not sure how I can troubleshoot the issue, and it may just be my unit.
This is fine for my use case but with the experience I've had with it, I'd be cautious about a long term installation that doesn't allow for frequent power cycles. If you restart it every day it should be fine.