How many clients can effectively take an AP?

With this plan, so that the customer will be comfortably:
Sust Down: 300
Down Burst 3000
Sust Up: 200
Uplink Burst: 1000

Canopy Lite 512 with License to 2000

Youtube, download of 5 Mb files …

How many clients per AP?

There is only one right answer…depends
On the cust usage. We have had 5250AP with 5megs down and 3megs up and 60 users…