Hey Soumyajit, Its nice that you are planning a trip to jaisalmer, basically trip to jaisalmer hardly take 2-3 days. you can go for under sky(camping at night), visit jaisalmer fort, you can go for safari.
for more detail you can contact me on my insta handle which is _kayastha Regards
Aayush
Exploring Jaisalmer takes atleast 3 days visitng all the forts, palaces, and ofcourse the stunning desert region. You can easily plan your trip to Jaisalmer using below travel guide.