If you want to take the Shimla-Kalpa route it will take you around10-12days. If you are going to a higher altitude place for the first time acclimatization is neesssary. The other route though Manali via Kunzum pas is shorter and the trip cam be done on 7-8 days. Howeve I would suggest, for reaching there take the Shimla-Kalpa- route and get back via the Manali route.
Hi,
You won't find direct buses from jabalpur to chanderi. However you could do the journey in parts; travel from Jabalpur to Sagar (buses available on Redbus app) and then chsnge to a local bus for onwards journey from Sagar to chanderi.