Here’s a rough estimate. Though of course this was a side project (~10hrs / week) and much of the time was spent learning.
V1 - Wordpress and jupyter notebooks (2 months)
V2 - Django (7 months)
V3 - Django + React (3 months)
What were the jupyter notebooks for? Did you run your backend in notebooks?
Wordpress version was basically just static plant pages. And I used jupyter notebooks to update them with new data (like product price and availability). Pretty funny to think about now