Actually, I think that poststreptococcal glomerulonephritis strikes on the order of months later.
BTW, most "strep" infections are viral. That's the concern with giving antiobiotics too early. That, and really pushy demanding parents.
My kids MD actually has 2 strep test kits in the office - one responds in like 2 minutes, but only checks for some types, then he has one that takes 12-24 hours. He doesn't prescribe unless you fail one of them