I made an app for astrophotographers to help us calculate the dithering and the total integration time needed. 
It’s a demo version, Ai assistant. Simple input the Lens focal length , F stop , camera , PA error , bortle scale , location and the target you want to capture and press the button “start chat" . Then type “results” to see the dithering and the integration time. If you have any questions u can continue typing to Ai to do a step further. 
I hope it saves you some time of calculating.
Clear skies 🌌 
Feel free to share with me a feedback.https://ai.tsourdinis.info/chat/YuuHUek3hgz6RpWq
Edited ...
Like