.timercalltime $+ $chan 1 $calc(3600 - %systime + $floor($calc(%systime / 3600)) * 3600 + 5) calltime $chan
check out the % function on $calc
.timercalltime $+ $chan 1 $calc(3600 - (%systime % 3600) + 5) calltime $chan
x % y = remaineder of x / y
alot simplier to write
