Have one instance for botting, and another project for just uploading.
For botting project, set auto interval to 2-6 mins depending on your settings, and for uploading, set it to 12 hrs or 24 hrs, or whenever you want it to post.
You don't have to make two instances for the same account. You have to click "show advanced options" on the bottom left of the first settings page and then on the sharing settings page you will have a "photo share limit" box. Set that to 1-1 and the delay to 12 hours.
Doesn't work like that.