Hello ,
Thank you for posting in the community. I think you can probably turn down some of the setting to get the rendering time down from 1-2 hours to something more reasonable like 20-30minutes. Could you confirm if you are using the Cloud Panorama Set or Presentation with Panoramas?
Maybe there is something in the scene causing it to take this long and we would need to investigate this further. Would you be able to contact us and report a bug so we can make sure there is nothing wrong going on there.
Here is the link to repost a bug:
https://twinmotionhelp.epicgames.com/s/case-community-page
We do not have an option to just update one image when exporting a Presentation with just Panorama images as the entire model gets sent to and get updated accordingly. This is the benefit of Presentation is that you can then freely navigate around the model and adjust certain visual settings.
The Panorama Set does not have an option to update just one image and you can make a suggestion in the road-map for such feature as you can upload up to 100 Panorama's in one scene currently. Road-map Link: https://portal.productboard.com/7pu88c9kpmqtzt8hwg6arujh/tabs/4-under-consideration
Kind regards,
Vincent B.