My LO is such a great napper that when I started getting 45 min naps, I knew something was up. I just jumped straight up to 1hr45 A time, and that did the trick but only for a week or two then I had to go to 2hr A time and he handled it really well. He struggled at first but stuck it out and he was fine. He still gets really cranky about 10 min before nap time but if I put him down right away I get a UT nap. So, I just keep him occupied for those 10 min before we do a really quick winddown and he sleeps 2 hrs. Actually, he's napping so well that I need to wake him from his naps almost every time! I've been thinking about cutting his naps to 1.5 hrs as well. Let me know how that works out! Now, nighttime sleep is a totally different story!!!!