The change in the scheduling window from 75 to 29 days on your Instagram business account might be due to updates made by Instagram. The video upload issue, where it gets stuck at 95%, could be caused by various factors such as your internet connection or the video format. To resolve these problems, make sure you’re using the latest Instagram app or website version, check your internet connection, try different video formats, and consider reaching out to Instagram’s support for assistance as these issues can vary for different users.