Maria uses minimal buffs, even in a dungeon. Fully buffed for her generally means PfE, mage armour, see invisibility, stoneskin, and either improved invisibility or GS. Mage armour, PfE/PfG, and stoneskin last more than 24 hours for her extended, so there's really no reason for her to not have those buffs on constantly now.
With my druid Lilindi I thing the only spells she has with a VFX now are elemental protections and spell resistance, and she's good for 14 hours on most of hers, non extended. She also has no reason to not be fully buffed all the time now.
That's not a complaint, I'm just mentioning it.