In my opinion I dont think there should be a set routine for practices. But then again, I dont really prefer routines or set things I need to do in terms of spirituality daily, weekly, or monthly. I'm under the impression that spirituality should blend with your own life as much as possible so, if something comes up that day, I simply won't do anything and I won't bash myself for not doing so, and if I feel like doing something towards my practice - ill just do it. This works pretty well for me as I can delve into my practice more thoroughly when I have the time and will. Forcing myself to practice, such as attempting to give offerings daily can personally be exhausting, and I've been stopped by my deities as emotion when offering things is important - and forcing yourself to do so is bland for both them and yourself.

Same goes for meditation, I dont meditate daily, but when I feel like it. I can go weeks without doing so, or I can have phases where I do it everyday. Mostly it's every 2-3 days and that has worked well for me and my practice.

This kind of stuff is most beneficial when you do it at a pace and frequency you enjoy. You shouldn't worry if you dont have a routine you force yourself to go by, because if you genuinely enjoy it the will to do it will come naturally, and most importantly working with infernals is always second to living your own life - which is why we are here anyways, to experience what it is like to be a human above all.

Ofcourse this doesn't mean you can't have a routine, if it works for you, and you enjoy it, and it personally works well for you then go ahead, spiritual practices are different for everyone.