While going on location in 200 feet water depth when the roll angle of the COASTAL DRILLER is 2.5 degrees, the roll period should be longer than __________.

Correct Answer: Option C — 13.0 seconds

Sufficient transverse stability during transit and location-changing operations is verified by roll period limitations; a roll period longer than 13.0 seconds ensures adequate initial metacentric height (GM) under 46 CFR stability criteria.