I thought chronic just meant PTSD that has lasted more than 3 months (ie it could start immediately but doesn't go away), acute is is shorter, and delayed onset is if it doesn't begin until 6 or more months later.

It seems that delayed onset and chronic could co-exist though. And complex has slightly different diagnostic criteria.

I'm actually not sure if I'm delayed onset or not. It's kind of hard for me to piece together when things started happening. Initially I really really slept a lot and was sort of in a dream world, and kept reliving things, it was later than symptoms diversified.