In that case a rate one (17 degrees AoB at 100 knots) would be more appropriate
How would one expect to work this out?
At PPL I was told a Rate 1 turn is 30 degree AoB at 90-100 kts
So in this situation.. if instructed to orbit for 3 minutes.. I would (if i knew no better) -(will look this up in ATPL stuff also/calculations etc) -I would just orbit at 30 AoB for 3 minutes.
This would probably take me around quicker than the 3 minute mark.
Just a reminder I guess that you need greater awareness of the situation you are in.
S.