When to visit?
You can visit Siem Reap all year round, however, make sure to look at the climate statistics before you go and while you are there and plan your days accordingly! The weather is tropical and variable. As a rule of thumb, the weather is driest from November to March, so if you want to avoid tropical rain, then this is perhaps the best time to book your trip!
How may days?
Most tourists go to the region to visit the local temples. You can purchase different types of temple passes. However, a three day pass, and three nights in Siem Reap will be enough to fufill any temple-goers!