Copy pasted from a post @jprspereira once did ( Wanikani is too slow and the Radicals are Useless. also Why Can't I just level up in one day instead of 7? - #51 by jprspereira )
This is how the items progress from Apprentice to guru:
Apprentice 1 => Guru 1 (3d10h, considering 4 correct answers in a row)
Apprentice 1 (lesson)
Apprentice 2 (+4h)
Apprentice 3 (+8h)
Apprentice 4 (+23h => consider this as 24h or 2x12h)
Guru 1 (+47h => consider this as 48h or 4x12h)
Once your radicals are gurud (so in around 3 1/2 days) you will get the kanji and once you guru the kanji you will get the first vocab.
Once you guru all radicals and kanji in a level you will level up and unlock the next radicals.
Theres a lot more towards this topic (read the whole comment), but thats the gist, which might help