In many Buddhist countries, devout Budd­hists observe the eight precepts on Full Moon and New Moon days by going to the Monastery / Vihars early in the morning and spending a period of 24 hours there. The idea is to withdraw from one's busy daily life in this material and sensual world and to cultivate spiritual development, self-training and peace of mind. However, this is optional and one needs to observe voluntarily.

 It is not compulsory for every Buddhist to observe these precepts all the time. After observing these precepts for 24 hours one is at liberty to return to his normal way of life. One who keeps away from worldly frivolities once in a while trains his mind not to be a slave to sensual pleasures.

 Many entertainments only increase the pas­sions of the mind which hinder the progress of spiritual development in man. It is only by restrain­ing oneself from time to time in this way that a per­son will be able to overcome his uneasiness, and be able to control himself. This practice trains him not to be disappointed when he is denied sensual plea­sures. Buddhist monks and nuns who have re­nounced worldly pleasures observe these precepts all the time. Buddhist lay devotees, on the other hand, observe the eight precepts from time to time. All practicing Buddhists, however, make a cons­cious effort to observe the five precepts every day. 

Atthanga Sila