I was going to make a new ticket but this covers it.

In my setting traveling between the planes is often done on ships rather than through the plane shift spell. That means I'm going to need a map of the planes and a system for determining how long a ship will travel to reach its destination plane. Having another unit of measurement, particularly a measurement of time, would be great for making this happen.

It would be very useful to have a user-specified unit of measurement. So if I want to set my units as "days" I can, or "flargels" or anything else I want!

I would also like to have it so you could calibrate the two points to be as Day/s so when my players ask how long would it take to travel to X from X I can just use the measure distance tool to give the estimate in days. You could then use adjust that number on the fly when the party uses other means to make that longer / shorter ie get horses/stealthing.

On a map that was pre made, just for example the Faerun one, that has some paths and lots of non road things just being able to measure the distance with the Measure distance tool and tell my party for example, its going to take about 10 days travel to get from Waterdeep to Baldur's gate.

I know Fredrik mentioned its available in navigation mode but if you draw any paths it seems to always snaps to them which isn't great when the party wants to go off road.

Where if you don't draw any paths at all it will allow a straight line and will say "no complete path found" but doesn't snap to anything still draws the line and gives you an estimate if you put in the speed of the people. Much more annoying then just being like measure, yep 10 days will get you there by foot.

This already exists though?

I think you'd need to specify what the mode of Transportation is then no ? And the current weather conditions. A lot of things figure into how long it takes to travel a given distance. Unless I'm misunderstanding the ask ?