It takes about half an hour. The week one runs are 5mins warm up 8*60secondrun/90secondwalk and then a 5min cool down. Do NOT skip the cool down, your body really needs it.
I tend to run around the housing estate/woods near where I live which is an area I know quite well and and can usually judge where I'll be at what time. But if not, why not run in one direction until you have done 4 runs, and then turn around? Then you'll be near home once you've finished.
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