How does setTimeout work in Node.JS?

Question

I guess that once it\'s executed it\'s on the queue, but in the queue is there any assurance it will invoke exactly after X milliseconds? Or will other heavy tasks higher on

Answer 1

setTimeout(callback,t) is used to run callback after at least t millisecond. The actual delay depends on many external factors like OS timer granularity and system load.

So, there is a possibility that it will be called slightly after the set time, but will never be called before.

A timer can't span more than 24.8 days.