When I have radicals available to learn, I learn them all at once. Most radicals are incredibly easy to remember.
I limit learning kanji to about ten a day. I find that spending a little extra time and effort to let kanji sink in makes things a lot easier in the long run.
I’m a little more fast and loose with vocab. If I have a big stack of vocab to learn I’ll sometimes go through 40 in a day, but I typically try to limit myself to 20. If you take the time to really learn the kanji, vocab is typically pretty easy.
All that said, I try and keep my apprentice items at 100 or below. Another good piece of advice is to only do new lessons if you’ll be able to do the first review (four hours later) exactly on time. If you wait too long you’ll completely forget them and you’ll have wasted your time.
My average time per level is sitting around 9-10 days, so my pace is relatively quick. Speed isn’t important, though, so adjust around what works for you.