Love the concentration overview and the estimate when it will be full again.

When I simulate a recipe that requires more concentration than I currently have, it would be great to also see an estimate of when just enough concentration will be available.

That estimate could show up either in the simulation frame, or when the recipe gets added to the craft queue -- the concentration number in the craft queue already turns read to indicate I do not have enough, a mouseover at that point could show how long it will take.