As cool as this project is, I have to say it seems entirely excessive. You can only fit so many data points on a graph and with the given timescale, you could easily take only a couple data points a day and still end up with an essentially identical graph. So I’d recommend thinning out your data more than anything else.
If you really want to take minute-by-minute data, I suggest sectioning your data into smaller sizes, having a different sheet for each year or so. Then you if you want a chart showing the entire duration of the experiment you can use a less dense data set, say 1 data point per day or so.
Statistics is an art of effectively showing a story using visuals and numbers in a practical manner. There is only so many data points you can shove into an interval before it stops making a difference.
I applaud the effort and detail, but I think it’s entirely inefficient for the story you’re trying to show.