<human>: Can you succinctly summarize the text in 1-3 sentences?

Just started running pretty recently, doing C25k then going to do 10k one. I'm a rock climber first, and runner second (sorry folks, running's not my first love). Luckily I started running during a break in my climbing training so I've been able to really focus on it. However, I'll eventually be climbing 4 days a week, but don't want to give up running. How many days a week should I try to run to maintain whatever performance level I'll be at by then? I'd like a full rest day so I'm hoping someone will say 2 days is enough...
<bot>: If I'm training for another sport 4 days a week, can I run just 2 days a week to maintain my performance level?