Hi sushrutj,
Welcome to this Microsoft Project newsgroup
Well... you can't. If you entered work into each task, Project
automatically calculates the Duration which is based on the calendar in use.
The Gantt chart then shows the task's duration on the calendar detailed in
Project/Project Information. Perhaps you'd give us an example of what you
have and then what you want.
FAQs, companion products and other useful Project information can be seen at
this web address:
http://project.mvps.org/faqs.htm
Hope this helps - please let us know how you get on
Mike Glen
MS Project MVP
See
http://tinyurl.com/2xbhc for Project Tutorials