Hello Nishit thank you for your message. We have also discussed about this task with our developers and finance and here is what we can do below:
Have you tried changing PHP V upgrade yet as it may be just a few touchups to adjust so the project run on latest PHP V. If you haven’t tried switching PHP versions then how do you calculate your 9-10 working days then.
If the PHP version switches with minor misconfigurations the company will increase you budget for this task.
Please let us know.