You could run longer is you want to but don't run until you are completely burned out then walk. The walking breaks are meant to be incorporated to keep your legs from fatiguing to quickly.
WTG on walking that first HM!
I wasn't even finished with the program I was doing (still had 2 weeks to go) and I ran three 5ks three weeks in a row. And I ran them entirely with no walk breaks! So I basically finished the program early and skipped the last 2 weeks.
Then I jumped right into half marathon training :)
Life IS Good!!
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