It is not a routine test run daily. It can rake a week or two to get the results, but usually there are a few weeks of fractionated radiation therapy to keep you busy when waiting and as results can shift chemo to TMZ, it is worth the wait. I found TMZ very tolerable. I took it a full year and am waiting to see if longer is better. One neuro oncologist thinks I should continue with watchful waiting as it might increase the chances of it being effective if any recurrence is suspected. I will get another opinion after my next MRI.