If the ANN is bad and unprofessional I just scroll through it and usually, I find things that confirm my doubts so it doesn't take me more.
If I like the idea and vision of the project, or I think it could be profitable for me, I take more time and check the roadmap, technical info, if the project is transparent, if team members are real and so on. Usually, it doesn't take more than 30 minutes but depends on the project.