The natural SP regen time is 20 seconds (same with HP regen time) unless you have 24/7 Zemyna around… Then, and only then it will become 15 seconds.
The video shows clearly a SP tick of 20 seconds (0:21/22 - 0:42/43 - 1:02/3), not 15 seconds…
The natural SP recovery is already very high for Cleric, it’s 288 base at max lvl 330. You can easily get more out of it by equipping e.g. Agni Necklace, Pore, Costume headgears (max 42 SP regeneration per costume headgear). or by item awakening.
If you don’t have any icreement of max SP via cloth armor mastery, you will most likely face a SP drain of 1320-2000 per SP tick, so unless you can compensate this you will always have SP troubles sooner or later.
However, this seems still currently only viable if you get that Yoghurt buff.
