If you’re a bit fit, and good on rough terrain, then this can be completed within 2 hours, depending on how much you stop and talk to people on the way.
Here is a Google Earth file of the route. There are many alternative routes up and down. Just explore, and ask “Sarangkot?” or “Lakeside?”.
I fyou want to know more about trail running in Pokhara, join the Pokhara Trail Running Google Group and share your information: https://www.facebook.com/groups/pokharatrailrunning/