Hi Rachana,
Please check build output for exact cause, Usually exporting pages may consume more time. If you have more pages and complex logics and more widgets used in each page also delaying package creation. also check any high resolution images used in project which also cause this issue.
Better Take Mendix technical team help to mention your application id and other relevant details after your internal discussion Submit a Request
Hope it Helps!
Thanks & Regards,
Manikandan K