On ath9k/10k the most I see for inactive stations is around 300s. On a D-Link DIR860L I see inactivity times up to half an hour on the 5 GHz radio (MT7612E) only. This leads to client counts being way off.
# iw client0 station dump | grep inactive
inactive time: 15157640 ms
inactive time: 2845020 ms
inactive time: 2614110 ms
inactive time: 2273520 ms
inactive time: 0 ms
inactive time: 1790190 ms
inactive time: 1109130 ms
inactive time: 989860 ms
inactive time: 987530 ms
inactive time: 916600 ms
inactive time: 927660 ms
inactive time: 744370 ms
inactive time: 580820 ms
inactive time: 565460 ms
inactive time: 80290 ms
inactive time: 100280 ms
On ath9k/10k the most I see for inactive stations is around 300s. On a D-Link DIR860L I see inactivity times up to half an hour on the 5 GHz radio (MT7612E) only. This leads to client counts being way off.