Like many mentioned. Live by your guarantee, everything else is gravy.
74 - If you must: Using 15.5 days gives you about 75 hrs when using the “you work 17 days” example. All dependent upon when you start and actually finish but it’s a good guesstimate doing “17 day lines.”
I have a 15 day line next month but it’s really 13.8 calculated since I leave late the Day 1 and get back 14 hrs into day 15 so maybe 67 hours using the 4.85. Block is 68ish and guarantee being 62. Being a lifestyle type I normally choose the slim line minimum days away. But sometimes I flex to 17 day lines but realize schedule changes are inevitable.
As highlighted before, impacts include Vaca, Training and per diem being on the plus side is actually being taxed right now though