Finally looked at some of the detailed itineraries for the trek. It's about 10 days to the base camp with no more than 6 miles a day and most only 3-4. It is all at altitude though and the estimated pace is roughly a mile per hour.
The most altitude gain is 2300' with two days over 2000', two days over 1000' and the rest less including a day of acclimatization with none.
The way back though is 27.5 miles with 9360 feet of descent over 3 days.
hiking3:46:54 [3] 9.82 mi (23:06 / mi) +288m21:11 / mi
Four times around the meadow loop, the first two with Sandy. We found a spot - nice shade, no poison ivy, good bit of room - to stretch after each loop.
My heel is quite tender. I guess I need to figure out something so it doesn't get worse.