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This looks like a generic question to me:
The number of client to associate the AP is limited by:
1) Return value of wwd_wifi_get_max_associations()
2) system memory
(unless your device has a lot memory) in most case it's likely the limitation is the system memory.
This depends on how much memory is already taken by your application running the AP.
You had better test it on a real hardware to get the answer.