Hotspot Trial user (down/up) client data limit

How this can be done?

I have free hot spot zone with trial users. Users are limited monthly by trial uptime limit and rate limit.
Selecting trial user profile I can only set rate limit..

Thank You for response!

any success ? have same problem…
thx for response…

have Just added a Script

http://forum.mikrotik.com/t/hotspot-data-limits/90475/1

this works well for me