Hey Bruce, this is where I'm at - but would love to combine these into a single rule AND ensure all this works:
If the Guest Bathroom Fan or Master Bath Shower Light turn on the Hot Water should turn on for 20 minutes (does this now). If either of those turn on again - then reset the 20 minute timer (not sure how to do that part).
If The Dishwasher turns on then turn on The Hot Water for 150 minutes (almost does this, but if The Hot Water was already on, not sure if it will work right).
And if either The Hot Water or The Dishwasher turn of - turn them both off (this could be problematic if The Dishwasher is on (for 150 minutes) but the delay rule turns off The Hot Water before expected).
Here are my current (new) rules - not yet tested, but should be good starting point: