What you said make sens, and now i agree but :

Originally Posted By: mIRC help file 6.2 about /timer

if you specify a delay of 0 seconds, the timer will trigger immediately after the calling script ends.


I assume it's the same in 6.3 and so, if 0 isn't a valid interval, the help file must not said that 0 can be specify, or at least that 0 will be taken as 1

Thanks for explanation

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