Um, just to help out, and as i didn't have have a clue.
Just tried it indoors, manual focus, jpeg standard.
Got to 35 and got bored, the little tell tell number on the view finder was returning to 22 as fast as the 51 took them,
So i suppose the answer is, when you run out of space ????
EDIT:
Just tried again through sheer boredom (big brother will do this to you

)
Got to 135, then realized the eye-fi card was sending to my comp :bang: i'll delete the fireplace later :bonk:.
Anyway turned off, 105 before mem card died, so i guess it is infinite, depending on card.