You're not increasing %i as far as I can see.
%i will constantly be 1. 1 * 3 = 3, so all timers will use 3 as their evaluation time.
if you just add "inc %i" there, it should work as intended. as %i will then after one loop turn into 2. 2 * 3 = 6, so the second timer will evaluate after 6 seconds.
