Umm… Since he’s a time traveler, couldn’t he have just visited Nightengale or Salk at a different time in their history, when they weren’t so busy? (sorry, too much thinking – just a comic, etc.)
Heck, in one installment, Wizard and Mrs. Wizard had a kitchen complete with sink, if memory serves. (At least I didn’t see a fridge, so they didn’t have electricity, just indoor plumbing!)
…and if he tries to ask, he gets “Well if you don’t know, I’m certainly not going to tell you!”.