@PixelPaul Thank you for your inquiry. To confirm, the work experience does not have to be full-time, it can be part-time as well. Here is a link to the CISSP Experience Requirements. The endorsement process can only completed once you have taken and passed the exam.
@PixelPaul No, there is not a maximum time frame, as long as the experience was earned at some point during your career. You may also use self-employment as experience. If selected for audit, or using the endorsement assistance application, you will need to provide the article or incorporation.