I was wondering the first levels as well, the answer is:
Q: Ok, what are all the SRS intervals then?
A: Here is the full list of the SRS intervals, along with the level you achieve when you get that review correct:
For Level 1 and 2 radicals:
2h, 4h, 8h, 23h (guru), 1w, 2w (master), 1m (enlighten), 4m (burned)
For Level 1 and 2 kanjis and vocabs:
4h, 4h, 8h, 23h (guru), 1w, 2w (master), 1m (enlighten), 4m (burned)
For everything else it is:
4h, 8h, 23h, 47h (guru), 1w, 2w (master), 1m (enlighten), 4m (burned)