How long does it take for someone that you've removed from your friend list and blocked stop seeing thing show up on thier friend feed?

from what I have heard once you block them, they no longer see anything that has do with you, immediately

Actually, when you block someone, you stop seeing things from them, but they can continue seeing things from you.

really i had no idea, though i never blocked anyone, , please excuse what I said then

If they're not on your friends list anymore, they shouldn't be showing up on your friend feed. Based on what it says on the Friend Feed Options page, if it's stuff that they've done before you blocked/defriended them, they should still be there. But if it's stuff that's happened after you removed them from your friends list, then something's up.

Edit: When I said all that (^) I was assuming you were concerned with your friend feed. Not theirs. Sorry if I misunderstood. If it's their friend feed your wondering about, they shouldn't be seeing your activity after you blocked them. If you're unsure, you should make a ticket to check.