In Romantic music, especially for piano, one can often find oversized tuplets like this one: (the excerpt comes from the very beginning of the 3rd movement of Grieg's piano concerto)
Are you really supposed to play them "precisely" (i. e., in the first bar, each note and rest for only 8/13 of the notated length)? That looks like a nearly impossible task (or at least countless hours spent with the metronome). Or is it "acceptable" to break them down into smaller parts (triplets, quintuplets, heptuplets), for instance like this?
Or is there any other way? On the recordings, the whole run is performed so fast that I can't even discern how exactly it is played...
P.S.: I don't play the piano at all. I'm just wondering since those tuplets seem to pop up quite a lot. Meanwhile the biggest (prime) tuplet I can play is a heptuplet, and I never found any larger tuplet in any rhythm practice book either.