4-month sleep regression hit different this time

My son had the 4-month regression and it was rough but we got through it. Now he's 7 months and hit another leap (apparently that's a thing?) and he's SCREAMING at night again. He was sleeping through the night, now he's up 2-3 times. Is this normal or should I be concerned? I read somewhere you're not supposed to sleep train during regressions so we're just... enduring. How long does this one last?