Statistics graph card - Why is "1 day" displaying as more than 24h?

I am using the statistics graph card to display a number of stats.
I have noticed, though, that while I have set the “Days to show” to 1, the duration shown in the chart is not 24h, but 24h plus 45mins.

It is not clear to me why, is there a way to force it to exactly 24h?

This is quite awkward, as I would like to use these charts to compare how an indicator today, eg my PV generation or power consumption, compares to the same time yesterday. This would be easy if the chart was exactly 24h wide; I could compare the start point of a chart line against its end. But with slightly more than 24h this becomes a more awkward guessing game.