Training x 2 Martial Arts, 4 days a week = crazy idea?

Hello!

So long story short, at 15/16 I achieved 1st Dan in Shotokan Karate, I stopped shortly after... I turned 30 and moved to a new area of the UK (London to Medway) and it turns out there's lots of local Martial Art classes, I've done very little fitness over the last 10 years, so I've decided to change that.

I attended a Kickboxing Class (with grading system), it was much more intense than what I remembered from my childhood Karate days but I loved it! so I've decided to sign up, they offer 4 classes a week (Mon, Tues, Weds & Thurs).

One Martial Art style which seems to difficult to find in my area & in London, is Shotokan Karate, however I found a small local class, which made me happy and they offer classes twice a week, Im attending a trial class too.

So Im looking for some advice, is it a wild idea to try and take on 2 Martial Art classes and train 4 times a week (some weeks it may be 2 or 3)? but I'd live to give each enough attention, also what can I do to help my body recover, good sleep and diet ofcourse, but is there anything else?

Thanks! and hope this post does not seem too silly!