My wife and I discussed this too. We just remind ourselves that the episodes are 8 minutes long (yes, the plots sometimes are for a whole day), so realistically the parents could be spending all this 'time' which is just in 8 minute increments throughout a day/week.

But yes, ignoring that kind of reasoning, it does set a very high bar.

Also, the parents do have quips/groaning about the requests of the kids from time to time which is does add to the authenticity.