^Harve Bennett says there was a 6-month shakedown between TVH and TFF, so I put TWOK through TVH in '85 and TFF in early '86.
The Yosemite scenes in TFF suggest a late Summer/early Fall placement. Accepting that TWOK begins in late March, and TSFS begins a week or two later, in early April, then TVH takes place around July. So the shakedown cruise couldn't have lasted six months, as that would place TFF around January, too early for the season portrayed in the film. I'd place TFF about two months after TVH.