If I see that 7.10 usk is looking out of bounds, then simply catch a taxi to jammu ( many returning cabs avl charging 70-100 bucks).
A taxi as late as 7.30 will get to jat by 8.45, then rush to pf#1 for USK
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Wearing sports shoe/cushioned shoes helps tremendously as it absorbs lot of jerks and dramatically reduces exhaustion on legs