This is the 12th longest period of time in the last ten years that the U.S. has gone without a school shooting.
It has been 67 days since the shooting at Pride Rock Residence hall at Texas A&M on February 3rd.

In the last decade, the longest the U.S. has gone without a school shooting was 136 days between April 2nd, 2012 and August 16th, 2012.

Prior to the COVID-19 shutdown, the most significant gap in regular school shootings was between May and August of 2018 when the U.S. went 71 days with no school shootings.

Of the ten most significant gaps this past decade in U.S. school shootings, eight of them happened over the summer:
'10: 120 days May-Sep
'11: 88 May-Aug
'12: 136 Apr-Aug
'13: 77 Jun-Aug
'14: 91 Jun-Sep
'15: 95 May-Aug
'16: 93 Jun-Sep
'17: 132 May-Sep

If the lack of school shootings keeps up for ten more days this break will be tied for tenth with summer 2013.
If school stays out for 20 more days, this will be the eight longest the U.S. has gone without a school shooting in a decade.

In 30 days from now (97 days in total), it could be the fourth-longest no one's been shot in a U.S. school in ten years.
If school remains out for 70 days (just over 2 months and into June), this could be the longest the U.S. has gone without a school shooting since Fall 2009.

All in all, I would suggest these gaps tend to be times when most people aren't in school, which makes sense.
Here's the thing though, I'm only looking at the top 12 largest GAPS in school shootings in the last ten years.

Since the beginning of 2010, there have been 233 recorded school shootings in the U.S.
Roughly 23 a year
or about 2 a month.
Having gaps of 3-5 months a year means that the frequency is much higher than 2 a month.

There's no message here, but I've seen some memes flying around saying things like "congratulations for 1 month with no school shootings"
On a factual basis, it's been over two months.
From an ethical point of view, don't forget how horrible this number is in the first place.

Hundreds of kids, teens, and teachers have died in the U.S. in school shootings. Thousands more outside of schools. This thread isn't just mass shootings, just school shootings.
For each month that rolls by without a shooting that's another month that kids get to go to school.

... To think about their futures and have hope. They don't see their friends die when there are no shootings, and they don't see people their age as headlines from the other side of the country.

I don't have a solution, but when it happens again, I hope people get as angry as the first time and don't look at it as some kind of normal.