likely to be only sparingly used - it will take out observing time from 6 major international scopes, each of which is essentially fully booked.

I really have no idea how that will work- what I suspect is that there will be scheduled OHANA runs, where all telescopes coordinate for a few days a month- I think viewing this as 'lost observing time' is rather silly... it is time spent to develop a new ability.

The big issue will be the testing and debugging time when no really fundamentally new images will be obtained, but "conventional" observing time will be lost.

Yup, and MUCH "conventional" observing time was lost when Keck installed the laser- the benifit from the laser is pretty much not up for argument- there are tradeoffs...

OHANA will be the same if it comes to fruition...