Remember that you’re in a support class tree
surely is confortable to have longer duration, but it also means that you should just use the buffs once and then forget about them and go dmg and heal things
Having 100% uptime is the most important part, it’s annoying to have to renovate the buffs all the time, but it’s kinda the point on being a support ;i
Alternativelly, you may go Pardoner for higher durations on certain buffs, and i’m not sure how meltastis (krivis c3) spell works, but yeah, there are ways
PS: i play dps cleric, and i’m totally in favor of longer durations, but i also understand that there is no need to make things this way.