Not Kidding, the Cessna Caravan with a cargo pod with a cruise of 170 KTAS would cover the distance ACI- GCI, GCI-JER, JER-DNR, ACI-CER, ACI-JER in less than the 15 min specified below.
AMC1 SPA.SET-IMC.105(d)(2) SET-IMC operations
FLIGHT PLANNING
(a) The operator should establish flight planning procedures to ensure that the routings and cruise altitude are selected so as to have a landing site within gliding range.
(b) Notwithstanding (a), one or more risk periods of no more than a total of 15 minutes per flight may be determined whenever a landing site is not within gliding range and for the following operations:
(1) over water;
Granted in very strong winds you would have to be careful, but I reckon the 15 min restriction could be extended after a trials as ICAO does not specific a time in its SET-IMC criteria in Annex 6 App 3.
Waves didn't start up for no reason.