The US used over 3.6 million gigawatts hours of energy in 2020. If you round down, and assume no increase in the last 4 years, that's over 9800 per day. 30 is a drop in the bucket. We have combined cycle natural gas plants, along with other green options to pick up for dips in production exactly like this.
A better question is how much energy we gain from solar if losing it for a couple hours once a decade or so is such a big deal.
If only there was a word that meant we used the path of least resistance.