i've had several lengthy plane rides upon which to hone my skills:

standard - 2:42
lotus flower - 1:55
confounding cross - 3:21
pyramid's walls - 3:55
tic-tac-toe - 3:55 as well
cloud - 4:32
red dragon - 3:18
four bridges - 4:20

i have mainly played standard and lotus flower, and have only played the others enough to make it through without "stalling" and without having to reshuffle the tiles. lotus flower has received the most attention, clearly.