Does the devcoin-app have to stay open 24/7 or can it be shut down most of the time and opened just to check or use it, or let it run at a certain time each day for an hour or 2.

Most of the times when I check it's using 100k, 175k, or even up to 250k cpu just running in the background. Some of the times when I check it's only using 5k, 15k, 25k cpu, but most of the times it's in the much higher range of cpu usage.