yeah it is normal. espisally if your meditation is for hours. I sit in seiza becuase thats how i was taught. thats sitting on ur shins. my feet fall alseep about 10 minets into it. i do have to wait a while to stand. my sensei told me a while ago that he has no problem but many others do have problems. its just a flexible thing. but thats awsome that u mediate that long. i take kobayashi shorin ryu karate do. hope this helps. c ya