The S&P 500 has gone 84 trading days without a loss of 1% or more.

As you can see by this table, that ranks it #17 of all streaks since 1950.

If it can last through February 27th, it will be the longest streak since 1995. If it can last through March 23rd, it will be the longest streak since 1966. The all-time record (since 1950) would take us all the way to June.