You may have learned this by now but there's also a 3rd "version" or "style" called Papadic which is very long. Also - irmologic generally means "1 note per syllable" and sticheraric pieces will have multiple (~2-3) notes per syllable. It's possible to have "slow heirmologic" hymns as well as "fast sticheraric" hymns.
@DofSproductions Each 'chant' or hymn will be written in one tone. There are 8 tones total. Each of the 8 tones have two versions - irmologic (the fast version) and stichereric (the slow version). There are also tones for the canons and psalms, but I don't know anything about them yet.
@EverythingZen14 @DofSproductions Actually, there are three versions: irmologic (fast), sticheraric (kind of slow), and papadic (really slow). The troparia of canons and the psalms are also chanted in the same eight tones that everything else is chanted in.
During the Holy Vespers Service of a Saint. Particularly a very major saint. For example The Virgin Mary, The Holy Cross, or it could just be during a regular Sunday vespers service