Read what it says "1st number 60 is seconds or 1 minute times 60 is 60 minutes or 1 hour times 24 hours or 1 day times 7 days or 1 week"
With that in mind "1st number 60 is seconds or 1 minute times 60 is 60 minutes or 1 hour times 24 hours or 1 day times 45 days"
Code:
houseCleanOld = 60 * 60 * 24 * 45 -- 45 days
See a pattern developing here?