This is the way everyone did it in high school, back in the 90's. You would lift weights, then go for a jog for 20 minute jog afterwards. The pace was slow enough that you lasted 20 minutes, but fast enough you finished out of breath.
It seems like every article I've seen for about the last 10 years says this is the worst way to do it. It's too much time, so its not intense enough for conditioning, or its too fast to last long enough for fat loss or something.
Supposedly, its the best way to lose muscle and store fat.
Lots and lots of people still exercise this way though.
These days I like cardio long and slow, like a 40 minute walk with the dogs, or brief but intense, like 12 minutes with the jump rope.