Not the usual version of this thread — they do pay. That's what makes it hard.
Terms are net-30. Actual: 34 days in August, 41 in September, 38 in October. Every one of them landed in full, every one after a chaser from me, and every time the AM is apologetic and blames "the finance cycle". Volume with them is mid five figures a month so this is a real amount of float.
Caveat on my own position: my media spend is prepaid, so a 40-day cycle instead of a 30-day one is roughly a third of a month's budget I'm carrying on their behalf. If I were running organic I probably wouldn't have posted this.
So what's the actual threshold? Drift with payment isn't the same as non-payment and I don't want to burn a good rate over ten days.