To echo on @Birdman7 . If they are spread out. They will fall one at a time. If they are in a row. When the 1st once ages. They all fall at once. But 30's loss most of the ding after a couple yrs. I had 1 late fall off in April 4 months early. I got 0 pts for it. But the BK may have overruled any gains. But its a tiny example that 30 day lates really dont hit you much towards the end.
Actually, it depends on the bureau how the strings fall is my understanding. From the Scoring Primer at Post 7 giving attribution for footnote 1 in the text:
Aging delinquency strings versus monthlies:
Attribution for: "...Experian...excludes...delinquencies in a common “string”...at 7 years from [DOFD]...The other two CRAs have no official, published policy interpretation, and have...excluded based on [DOFD] OR have treated each...delinquency as its own separate adverse item of information, and thus have not excluded...until each has reached...7 years..."
. RobertEG Jan 2020, Permalink.
So, I guess it depends, YMMV.