My DS is a delightful gift but famous for being a short napper and frequent NWer. I'm pretty sure he's LSN. At 12 months it was clear our only option was 1 set nap as A times weren't working and he was refusing the pm nap. I tried set nap and BT but unfortunately the nap didn't lengthen and I'm still waiting for it to do so
. But, if it helps this is what I was doing at 12 mths:
WU (all over the map ranging from 5:30-7:30 (on a very rare day)
11:30 set nap (1 hr 10 min average but was broken)
6:30 set BT