I am just coming back from trekking Heights of Alay. Official map shows a 80 km round, starting 20 km away from Sary Moghol, clockwise, and finishing in the same village. If you are a purist, you can do 20 first km by feet, my opinion is 10 first km are not interesting, 10 km after a bit more. I hesitated a lot and I finally took a shared car with 4 other people (2000 sum total).
I had a tent, camping gear, food in bag (10 to 13 kg I would say). Otherwise there are still opened yurts, will close till mid September I think, ask to CBT. Weather OK.
Day 1: SM pass, altitude of 4300, not given, carefull after pass steep descent, my trail runing shoes were a bit used, slippery ! Time: 6h to reach yurts after pass.
Day 2 : Very smooth descent to Sary Moghol (same name than first one but much smaller), after, a road flat to Kyzil Chara, there is a small shop, ask. I was supposed to camp at Yurt camp after Kosh Moinok pass but it was 2 PM and weather was good. Decided to go ahead, camped just before Kojokelen, nice place with Utah like red cliffs. Time: 10 hours
Day 3 : Long road from Kojokelen to Jiptyk pass, 22 km, then, descent to Yurt Camp, 10 more km. Asked myself if I continued but spending night into moutain was nicer. Time: 12 hours
Day 4 : 10 flat km to SM, 2 hours
My advice: doing it clockwise maybe better, from Jiptyk pass you will see Lenin Peak, so nice. I did not expected it! And last 10 km, same, see Lenin peak! Counterclockwise you will have it in your back
This trek is really (really) beautiful, even if roads part are a bit boring...