When you narrow the parameters like that you are right. They could have accepted the offer a month or so earlier and found ideal conditions to test it under a week or two ago.
I’m trying to get an accurate schedule for the vessel. It left China late in April, finished conversion in Portugal in June, then sailed to Norfolk. If memory serves, it was tied up there for about a week.
Incidentally, this is the first test with actual oil. The tests in Portugal were done with fire foam.