[Mitchell]

g_time_float isn't actually used
Also I don't think you need to Kill the timer just return Plugin_Stop at the end of the timer.
And you should atleast pass the client's userid into the timer, instead of the client's index itself, that way if the player disconnects before the timer executes you won't get an error.
and you don't need to include sdkhooks, everything you use is within sdktools.