it takes ages to me too
for the xwing i didn't unwrap the model so i had no templates, i taked screenshots from different angle of the model, then i selected the areas that will be mapped together, cropped the screens and used em as template, then i draw using filters the backgroud that will remain the same for all the maps.
for the xwing i had about 16-17 different parts, each part required from 20 min(engines fans, engine/laser textures) to 2 hours (estimated, for the wings and the rear), but this is only the easy/funny part of the job
To build the final maps out of the different parts (5 256*256 + 3 128*128 maps is the final count), make the uvmaps, apply them, make the retouchs, rebuild the textures, reapply them takes at least the same time required to draw them
counting all the steps i think it takes me about 20-30 hours in total, but i'm not sure, i'll check the time better for next ship