Hehehe... I have more than 2 months invested under the hood and associated running gear!.. and it was running when I brought it into the shop!
Hope it still runs when I am done... fix it till its broke, right?..
Might have helped if I started with a bus that wasn't rapidly approaching 50 years old... ha!... but even on a newer rig in my price range... there would be some wrench time regardless.