Hi, Can someone please tell me how long it will take to implement suitetax app in the existing account (netsuite implemented couple of months ago)? Can we configure and do basic testing in a week? Thanks

Possibly. We used NS support to help us implement and they did the configuration and setup for us. You need to have the bundle provisioned and a few other steps before you can access it in sandbox and configure it. Actual configuration took about 6-9 hours.