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The distance from the car park to the sites is about 200 metres, involving an ascent (on a built concrete walkway with steps) of avout 25-30 metres. I'd say if your condition permits you to travel that far, then making the last bit should not be a problem.

No way. You need about 1.5 hours to get there, same back, and you need to be at the airport for the 5pm flight latest around 3pm. To visit Laas Geel you need to arrive the day before, and start early in the morning. We did this, taking the 5pm Ethiopian flight the same day and starting from Hargeisa at 7:30am. With these times, we just had enough time there (about 4 hours) to comfortably see and photograph all nine shelters around the hill.