A large number of Qtimers and guarantee of clicks.

[pkj]

I think the logic of your application is not valid.
Let's take an example: 2000 clock with a period of 1 s which gives 2000 signals per second. Suppose that a signal service time is 5 ms which gives 10 seconds of time to support the 2000 event. During the 10 seconds You have received 20,000 signals and serviced only 2000. How do you imagine the proper operation of the program?

That looks a very valid argument. I think I should stick to old idea of having a single timer managing all the timeouts. Most of 'em happen at around the same time anyway.

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Added after 11 minutes:

No, it means that if a timer has an interval of X miliseconds but the program is executing some function (related or unrelated to the timer) that takes more than X miliseconds (e.g. 2x X) then a timeout might be discarded.

If I understand correctly then the event loop of application is a kind of a endless loop.As described in this document http://doc.qt.digia.com/qq/qq11-events.html. So it is kind of always in a function?? Do you mean if it takes 2x ms in a single function? Or if the event queue is not empty?