Well, I have a LED class, for example with 2 timers, one that controls the fading and other the blinking, and I put lot's of them in one form to test, and i can use more than 10 LEDS (20 timers) with no problem, eventhough the 'fading timer' has a very fast rate, but...

Although I would have no problem having multiple timers doing something trivial like the LED, I would be very weary of using more than one timer to handle the same data (or diferent tables of related data). Keep in mind that the way the timers work (AFAIK) is that when one timer fires, it stops the execution of any other code, even other timers, runs it's code, then returns to the where it was, for example other timer's code, so your data will be in an non defined state