Node.JS中可以同时运行的setTimeout()方法的最大数量是多少

I have a java script file which runs using nodeJS. I am using the setTimeout() method to create a sort of timer which will run some code after a user specified time. As multiple users will be using this code will there be a problem with running lets say 1000 setTimeout methods in parallel? Is there a maximum number that can run simultaneously or will it just make the program run slower the more I have?