I want to see how many hours works on my project (all open documents total hours) or a document. Are there a plugin or notepad++'s property?
Not that I know. It would be fairly easy for a plugin to catch when a document is activated or closed, and when the app itself is activated or not, so as to ask for system time on each such event and eventually wrut a report when N++ closes, or on demand.
yes I agree with you. or can be added "how many hours works on this session"s info in a sessions file, or can be added "how many hours works all open documents"s info in a notepad++ log file and readable from log file, or can be added "how many hours works on project"s info in projects from project windows.
but probably, the best method is processing a log file.