Not really sure how the 36 hours works. The Budapest trip i used as an example would be 46 hours door to door. The Malta trip pointed out would be about 44 hours door to door. Reduce the trip to an overnighter and you end up with less than 24 hours. YOu would really have to be creative to come close to 36 hours.
We do short flights on about half our trips. Generally for a 2 night stay someplace. Usually to see something unique or attend a holiday or festival. But sometimes just for the heck of it; Moscow for the Bolshoi, Jerusalem for the first day of Hanukkah, Kyiv for Independence Day (all cheap non-stops out of Budapest).
I guess we have just been efficient as adding 3.5 hours to the flight time as always turned out to be a real prediction of the total travel time on our junkets. With a train i add 1.25 to the travel time for the same door to door comparison. Again, has always worked for us.
But yup, you gotta plan it around the discount carrier schedules. And you have to travel light if you want the cheap fares. But on a two night trip, that works.