As many times as you like.

Tragic did a cool bit on shuffling on one of his vids.. even has a guest spot fomr the mad Russian.

In it he linked a cool tutorial vid

Dang, both videos are pretty cool with different shuffling ideas. Thanks for posting those guys!

So far Ive had my Fantasy flight clear sleeves for almost a week and i still could not be more pleased so far. They are not the cheapest sleeves but they are definitely not the most expensive either. I find them right in the middle of the road. I shuffle some a little like the first video above then use the old random 8 stacks trick and then cut and it seems to work well most of the time without any problems.