Is `setTimer` workable for long term timers, e.g 30 days?

[greenfork]

You could probably test it. Create a thousand timers and see how it goes. If 
you are doing IO, this shouldn't be a problem, only OS is the limit. If you are 
doing CPU intensive tasks, then it depends, generally it is better to use 
threads instead of event loop, which is used by `addTimer`. You might also want 
to set the `ulimit -n N` in the terminal so that N is greater than the number 
of timers because each timer will take a file descriptor.