One for the pace-calculating gurus:
My little guy can only stand about half an hour in the stroller before he starts to drift off for an unsanctioned nap.
So here’s what we often do before work:
3.8 miles to the playground
play for 20-45 minutes
3.8 miles home.
This morning we actually did perfectly even splits: 28 minutes each leg, for 1:24 altogether. We’re in Philly, so there are all the usual urban obstacles–waiting for stoplights, dodging potholes, etc. On the four stretches (two each way) where we can go at least a mile with no interruption, we typically hold a sub-7 pace.
Now the question–I kind of wonder what this run is equivalent to in terms of a single-leg, no stroller, no obstacle workout. Something tougher, presumably, than 7.6 miles at an 11-min/mile pace (which is what it technically is). If it matters, he weighs about 26 pounds. I don’t know about the stroller, but it’s your typical jogger.
huh? I’m not sure what you’re asking…but two 3.8 miles runs with a 45 min break is simply two 3.8 mile runs with a 45 min break. Trying to convert the effort into an equivalent single run doesn’t really make any sense. With that long a rest period, you should be completely recovered.
I run with my daughters in the jog stroller quite a bit. On my standard neighborhood route (rolling hills) with the same level of perceived effort, I run about 20-30 sec per mile slower with the stroller than without. On the flats, the differential is only about 10 seconds per mile.
FWIW, I have the same problem, my younger daughter (2 y/o) falls asleep about 30 minutes into the run. The older one (3.5 y/o) stays awake the whole time now (and tells me to run faster usually) 
I maybe wasn’t clear, but your answers are very relevant to what I was trying to ask–thanks!
(I admit I was kind of hoping somebody would say, “oh yeah, if you can do that double with a stroller, you should be able to run a 32 minute 10k, no sweat!”)
I don’t know that I feel “completely” recovered after the break, though I definitely feel ready to run some more.
As for how much the stroller slows you down–I also find that the flats are not much different (unless it’s windy). And you’re pushing the double, so doing a good bit extra work.
Just as a clarification, I don’t use a double stroller…I only take one of my kids at a time.
Pushing a double and both kids up some of the hills in our neighborhood would definately slow me up more than 30 sec a mile!