I am SLOOOOW and trying to improve speed... At one point, I was at 5+ hour / model.
These terminators took about 1-1.5 hours each.
White undercoat
Paint base: Scorched brown, Bestial brown, Bubonic brown - 5 mins ea
Basecoat camo green, boltgun metal - 20 mins ea
Devlan mud wash - 5 mins ea
Rehighlight camo green - 30-45 mins ea
Gems and details - 5-10 mins ea
These long gunners were probably closer to 2-2.5 hours each.
Undercoat black
Paint base: Scorched brown, Bestial brown, Bubonic brown - 5 mins ea
Basecoat khemri brown, boltgun metal - 20 mins ea
Wash devlan mud 5 mins ea
Paint straps, gun stock, face and hair scorched brown - 10-15 mins ea
Base blue portions in Cygnar Blue Base - 5 mins
Highlight blue portions in Cygnar Blue Highlight - 5 mins
Highlight all light khaki areas with progressive build of Khemeri brown / Kommando khaki mix from 100% Khemri brown to 100% Kommando khaki at highest highlights - 30-40 mins ea.
Face: Mix of scorched brown and elf flesh, gradiented highlights 15-20 mins
Hair: Various browns and yellows: 5 mins
Straps / Gunstock: Calthan brown highlight: 5 mins
Goggles / eyes / gems etc: 10 mins
Cleanup: 5 mins
This was from the peak of my slow stage at 7+ hours