<human>: Newbie here, I mostly live on R/Fitness but I came here to ask you all a question if you would be so kind.

I suppose you could say I was a beginner > novice runner, I used to run 3-4 miles 3 times a week, sometimes more. My 5k time is around 32 minutes. 

Since Xmas I've been following a weight training programme 3 times a week(Stronglifts 5x5). The problem is that this doesn't stack with running.

I want to focus on the lifting for now so this means running will be taking a back seat. My question for you is this:

What's the minimum amount of running I should do to maintain my current level of cardio fitness?

I don't want to lose the fitness I built up but I can't run 3x a week once I've finished my lifting shcedule - that isn't enough rest time. Atm I manage 1 or 2 runs a week of 2 miles. 
Will this mean my fitness goes backwards? Anyone here have the same issue?

Can you provide a brief overview of the text?
<bot>: I run 5ks 3 times a week in 32 mins and am switching to weight training so can't run much. How should I keep the level of fitness I've built up?