I also had runner's knee and took off! Ran a 1:30 half in the beginning of November (was also slightly injured at that point too), and then continued running afterwards until the knee pain was getting bad. Stopped running 12/1/2018, and started again on 1/1/2019. (NOTE: I start my weeks on Mondays, so I'll show my schedule that way, staring on Monday, 12/31/2018.)
All paces are at 8:00 - 8:30 pace
Week 1 (12 miles): Monday off, every other day was 2 miles per day
Week 2 (22 miles): 2 miles per run, doubles on M/W/F/Su, singles every other day
Week 3 (in progress): Monday ran 2mi in the AM, and 3mi in the PM! First 3 miler. :D
I'm going to continue this way, doing 4 - 7 doubles per week, and increasing my longest run my a mile every 2 weeks or so. I'm going to increase my mileage by up to 4 miles per week for the next few weeks until I'm not scared of re-injuring myself. Once I'm confident my joints are happy, then I'll introduce speedwork, starting with just simple progressions and easy strides after some runs.
Not sure how YOU should progress, but I figured it would be nice to give you a perspective on how someone else returns after an injury.