We had a recent discussion about comm schedules:
As far as effort being expended in searching for you, I share the opinion that a very wide latitude should be anticipated for transit and arrival times. Specific advice can be given to a trusted shoreside acquaintance in the event there is no news after a set period (probably double the anticipated transit time). Tell friends and family that you'll activate the EPIRB if you need help, otherwise you're fine and delays are likely due to weather or mechanical challenges.
Glad the watermaker worked well for you. It does sound like a worthwhile piece of equipment.