It's possible no one will care much if it's down even for that long. I couldn't care less if my HOA mobile app was down even for a week for example. We don't need constant uptime for everything.
I agree with the overall sentiment, but having an HOA app go down around the time when dues need to be paid could be a serious issue.
Don’t forget that integrity matters as much as availability in many applications. You might not mind if your HOA takes time to bring a server back up but you’d care a lot more if they lost the financial records or weren’t able to recover from a ransomware attack.