Welcome to TPG Community!
It will normally take 1-3 business days for the change of plan to be completed, but there are cases that it is completed in less than 24 hours.
There's no need for you to worry as your service will not be affected while the plan upgrade is in progress.
We can arrange one of our change of plan specialists to contact you to further discuss the matter.
Please PM us your TPG customer ID, username and complete address together with your best contact number and most convenient time to receive a call.
To send a PM, please refer to this link: How do I private message (PM) in the community