I’m currently modelling my car using Blender. The screenshots show the progress of approximately 2 weeks (entire weekends and a few hours after coming home from work). Some parts are created rather fast, and some parts take hours to get the shape correctly. Worst part in that matter ist the front bumper with its fog light. It took almost the whole weekend. The hood was made within an hour, since it has a simpler shape, compared to others.
For reference I use photos, where I do the details by eye measure. To get the general shape I traced the views (front, back, side, above) from drawings of the cars manual using Affinity Designer beforehand. This alone took me over one week, beause I only could do it after work.