Long story short.
The one’s you don’t finish won’t appear on your reviews later until you finished them. The one’s you finish now will appear on your reviews in a few hours.
So if you think things are slow, then go ahead and try to complete a large amount at a time. If you want to take it slow, then break the lessons down and do a couple.
Me personally, I’ll do 20 KANJI at the most in one sitting, the rest (vocab and radicals) i’ll just do whenever.
In order to accomplish this though, you may need to use a re-ordering script so you can do kanji first.
User script list (under ESSIENTIAL)