Phnom Bok is a steep hill of 235 metres in height, and the third peak of the Angkor region after Phnom Bakheng and Phnom Krom. It has a small temple on mountain top called Phnom Bok temple the same name of mountain called Phnom Bok also and this temple was built by the king Yasovarman I (889–910) between 9th and 10th centuries.
Due to this mountain a bit so far if you do sunrise tour require to leave from your hotel a bit so early and climbing during dark between 45 minutes to 1 hour. If you do sunset tour for climbing take around 30 minutes to 45 minutes.
*** You will feel fresh from the fresh air and you will like it because make you away from the crowds.
If there is any way of squeezing it into your itinerary, it is well worth it!