Question about muscle atrophy and taking time off

I have recently started a new era in my life and my mass building routines are out the window for at least the next 4-5 months. I am currently only able to lift 2 -3 times a week and am doing crossfit type training 3 days a week.

My first question is, will I lose any muscle mass I had before and long as I maintain a good caloric intake and stay active?

Also, would it be advisable to perhaps cut my mass building down to back/bis and chest/tris on the days that I am not doing crossfit training? Leg workouts are not a consideration right now due to the fact that I will be running upwards of 3-8 miles a week.

Any help or recommendations are appreciated!!!!

If you can train with weights 3 times a week then you should be ok. If you not used to all that running then yes you probably will loose some size. Id do a push, pull, legs split. If possible but just got to see how you feel. dont sweat loosing size you can always get it back.

Definitely not used to the running!! haha!