It is not unrealistic to have a lab up for a week with no significant problems, at least once you get it up.
Granted I only spin up 2 or 3 labs (for a few days at a time) in little groups separated usually by a few months of doing nothing with them, so maybe my experience isn't typical. But ...
It is not uncommon to have to try to start a lab a couple of times. It seems there's about a 25% rate of "failed to start lab", at least in the pcce/pccx/ucce/uccx related labs, but usually you just cancel/stop the broken one, and 5 minutes later you can try again and it'll usually be fine.
Rarely, everything looks OK with the lab but when you try to do things you find it's broken. Tear it down, restart it, it's almost always fine then. And while annoying, in both of these cases it becomes obvious something's wrong pretty quickly and it's only an extra few minutes to click the buttons again.
Once it's up and running they're usually OK for the most part, and any problems you may have are typical something around the web ui or access to them, are transient and are short lived, sort of like the one we're having now. The machines on the back end seem to generally be running fine, so except for those few times I've seen the VPN be unconnectable for an hour here or an hour there, most won't stop you from doing what you need to do as long as you remember the IP of where you need to go.
But as mentioned the majority of the problems I've had have been at lab instantiation, not once it's actually up and running.
