Sounds like a you problem. You always have access to how much time remains.
I kind of like that idea. I mean I keep an eye on it but if you did not have to do that it would save some time and just be nice to have. Not a required thing just a nice thing. Especially when you are running rainbow boost for content. It can be hard to keep checking to make sure something does not run out during a fight that you might want it for.
i like this idea, it would be a nice qol improvement