personally this spring track season i had good success lifting 2X a week on easy days (Mon & Fri). 50-110 minutes VERY easy in the early a.m, breakfast + recover a bit, then into work for the morning before lifting over lunch.
i felt the easy run served as sort of a 'shakeout' for the lifting session & i could really get after it (as opposed to if i had lifted first, then ran afterwards or later). also lifting later in the day when my body was fully awake allowed me to put up more weight than if i stumbled into the gym half-asleep at 6am and tried to lift (just like how you wouldn't schedule an intense interval workout for the early a.m.).
typical week looked like:
M-8 + lift
T-5 am,10pm
W-8
Th-5am,10pm
F-8 + lift
S-10
S-15
did workouts on Tues & Thurs nights. lifting around noon on Mon. didn't really affect how i felt Tues pm as i had 24h+ recovery time (if i put off heavy lifting until Mon. night i would sometimes feel it Tues. pm).
i like 2X a week because 1) i get next-day soreness if i only lift 1X a week, and 2) i think their is a real nueromuscular/muscle memory component to the big lifts (squats, deadlifts, cleans) and you won't get good at them unless you do the movement frequently.
i set PRs in the 800, mile, and 5K this spring in my late 20s, i have no doubt the emphasis i put on lifting played a big part in this. my speed was as good as it's ever been, and pound-for-pound i've never been stronger.