The question popped up while my wife was doing research on her novel, which is set in a fictional universe that parallels Ming Dynasty China. We tried to do research, but we have yet to come with an actual time frame.
To be clear, by "return to normal" I mean a state where all the bodies have been cleared out and conditions were roughly the same as what they were before the battle: People walking about freely, businesses reopening, vendors and traders selling their wares on the street, so on and so forth.
The research I've done so far has been largely inconclusive. Most of the webpages I'm seeing for the aftermath of Ming Dynasty battles don't really talk about the return to more mundane, day-to-day tasks, they largely talk about diplomatic ramifications and civilian casualties and such.
Hi there - we're happy to approve your question related to your creative project, and we are happy for people to answer. However, we should warn you that many flairs have become reluctant to answer questions for aspiring novelists and the like, based on past experience: some people working on creative projects have a tendency to try to pump historians for trivia while ignoring the bigger points they were making, while others have a tendency to argue with historians when the historical reality does not line up with what's needed for a particular scene or characterization. Please respect the answers of people who have generously given you their time, even if it's not always what you want to hear.
Additionally, as amazing as our flair panel is, we should also point out that /r/AskHistorians is not a professional historical consultation service. If you're asking a question here because you need vital research for a future commercial product such as a historical novel, you may be better off engaging a historical consultant at a fair hourly rate to answer these questions for you. We don't know what the going rate for consultancy work would be in your locality, but it may be worth looking into that if you have in-depth or highly plot-reliant questions for this project. Some /r/AskHistorians flairs could be receptive to working as a consultant in this way. However, if you wish for a flair here to do this work for you, you will need to organize this with them yourselves.