Yes, I think it helps me feel more accomplished, because 4 km is 4 km, regardless of the pace, while 20 minutes might be a huge accomplishment or me slacking off.
It's a good idea to go by time when you don't know the area. I expect you're an experienced enough runner too, to know how hard you're working?
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It's a good idea to go by time when you don't know the area. I expect you're an experienced enough runner too, to know how hard you're working?