The best method to kill TIMER

[kunam]

hi all i need your help here...
in my apps i create more than 30 TTimer thread classes.
when application is execute, all TTimer i set to enable.
inside TTimer i place some code, this code act like this
- random x
- if x is equal to TTimer (in miliseconds) then application closed
so guys, how to break before TTimer CALL application close,
i just want to NOP this call.
(because my apps random the time when its closed, my apps can close in
different range of time of course)
what is the best method..???
thank you