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Open the Bookbinder tribute and mouse over the production bar to get the time remaining tool tip.
Note the time.
Try again in the same session any amount of time later any number of times and the tooltip will display that same time remaining.
To get it to actually refresh, you have to restart the game - even visiting another island won't refresh it.
if you have another tribute building (friary or hunter) you can click on that and hover over the time remaining, then, click back on to your bookbinder tribute and the time will have updated....trial and error lol it does work.
I have matched mine to the gift christmas tree timer, also 7 days.
If you put the bookbinder on sleep it will work until it's ready to walk back to the storagehouse.
When you gift christmas tree timer runs of (or later) you know the 7 days are gone. Place an Elixer on the bookbinder(s), awake the building and your 5 (or 10) books will come to you.
When it's running again put it asleep for the next 7 days.
IMO your always sure of getting the most out of it.