I'd say about 4 hours assembly (they are heavily magnetized) and roughly 13-15 hours to fully paint and base. Considering the 10 Flashgitz I finished ran me about 30 hours from assembly to fully painted, its not a bad pace.
I find these big models actually paint up very quickly. They are comparatively uncomplicated, with much of the detail being done with transfers and very simple shading. Small models with lots of bitz and bobs are much more difficult to get right and work with. I will have my full army of 4 armigers, 3 questoris, and 2 dominus knights done by August I think. A full army wrapped up!