I would raise it over a couple of days to be safe, but from my reading, there is very little danger in raising calcium quickly as opposed to Alkalinity wich must be rasied very slowly.
you could raise it up within the rest of the day.... ive done so many times and have never gotten an effects that were bad.... taat2d did u also check your alk and your magnesium..
if your magnesium is low raising ur calcium will do pretty much nothing and u will be back down to 360 ppm in a short while....