LoL ... 7 hours ain't that unusual for an older PC to have to crunch, however, you can, if you so need, turn off or reboot, for updates to the OS for example, any time you like ... once the PC is restarted, Boinc will resume where it left off.
There is, however, a cut-off date by which time the PC should have returned this work unit in by ... I think it's seven days.
This bit now!, is the waiting game ... you wait, keep looking, see nothing, keep looking still see nothing, then the next time you do notice ... it ... moved.
It is the longest wait any of us have had to do n out lifetime ... our first work unit turned in.
We may be here for awhile, shall I get you a drink ?
As for the temp monitoring ... download SpeedFan, just run it,
do not mess with it, you will "see" which temp belongs to the CPU ... the HOT one ... if it's too high for your liking, use Boinc's setup to lower the % till you are happy.
I have my sisters old PC her running at 60%, temp fluctuates between 45/55 ... temp monitors are only a guide, so keep it within reason to you.