I use the lesson filter script to do 3 kanji and 9 vocab lessons a day. After I level up, I do all of the radicals on the first day of the new level (if there are less than 10, I’ll do a few kanji as well), and after I run out of kanji at the end of a level, I’ll just do 10 vocab a day until I guru my last kanji and level up.
This results in a pace of leveling up every 12-14 days, with roughly 130 reviews a day (assuming you’re doing at least three WK sessions a day and hitting the 4 hour and 8 hour review intervals for the new items). I’m really happy with this pace, personally. It’s not too exhausting, and it still allows me to progress at a decent clip. I’ve been able to balance kanji, grammar, additional vocab studies, along with immersion, without having too much trouble fitting it all into my life.
I do have a fair amount of free time to put into Japanese, though not as much time as some people, and I personally would not recommend going above the 12-14 day level up speed unless you have more time than I do. I easily spend 1.5-2 hours minimum on Japanese every single day, not even counting immersion.
With the lesson filter (and probably other reorder scripts), you have the option to distribute the kanji lessons throughout the level, and I highly recommend trying this out. It helps with level-up consistency, and I’ve also found it a lot more effective than learning new kanji in huge bursts (my accuracy measurably improved after I started spreading the kanji lessons out), plus personally it’s more motivating to be able to learn kanji throughout the level and not have to spend a week at the beginning/end of the level chewing through a bunch of vocab lessons before you can get to the new level content. If you do try spreading out the kanji lessons, if you aim for a roughly 1:3 ratio of kanji to vocab, you should be fine.
Personally, I’ve had pretty good success tying my WK progress to my other study tasks by aiming for getting one Minna no Nihongo lesson done every WK level. That keeps me constantly pushing forward with the textbook, which is providing most of my grammar and additional vocab (I pre-learn the vocab for each lesson before starting to read it).
I’ve also had good success with the read every day challenge, which has pushed me to do a lot more reading. Just make sure that if you are going to be using Anki, don’t overwhelm yourself by adding too many cards. When I first started using it, I only used it for textbook vocab. I only started mining vocab from native media this year, after I’d been using Anki for months and it was pretty ingrained in my schedule.
Basically, I’d start with getting your WK schedule figured out, then work on integrating other study habits slowly. Especially if your plans involve using more SRS. I’d also recommend adding a consistent number of lessons each day instead of going by apprentice counts, because adding a consistent number will result in more consistent review counts, and that consistency will be your friend if you add in another SRS like Anki and have to juggle reviews for both.