Kandol Lake trek is easily possible in 1 day.
We did this trek in start June 2014, We started our trek around 12:00 mid day from Bridge before Laddu village and reached @ Kandol lake in 3 to 3:30 hours and stayed there for 1 to 1:30 hour and reached back at Bridge @ 7:30pm.
If you can start early morning then you can easily do it in day light.
There is no Hotel at Laddu, May be anyone at Utror(I m not sure)
You can easily find guide from Utror.
I don;t think Badogai pass will be open now a days.