Batch painting, in a word: Sucks.
I'm really notta fan, and I don't think its all that fun. However, as is so often seen on the Mordian7th blog* its the best way to get a bunch of minis painted up fairly quickly. For example: Nine and a half months into 2018 I've fully painted, from start-to-finish the following:
January:
Cadre Fireblade
February:
Kushial's Leviathan Dreadnought
Rebel Ghar Commander
30k Black Shield
March:
(4) WHFB stone walls
An IG hillbilly
April:
Rainbow Warriors Predator
May:
Wreck-Age Technical
Ork Kommando
June:
Salamanders Primaris Sergeant
30k Blackshields Medusa
Ork Nob
July:
Awesome Battlemech
August:
Grymn Vanquisher battle tank
Over the course of 8 months, that's an average of 2.125 miniatures painted per month. Yay?
That brings us to September:
Whilst nothing has been fully painted yet...in just three painting sessions spread over as many days, I have EIGHT minis about 3/4 painted. All that remains to be done is a light dry brushing of their clothing to soften the inking a bit, then dirty 'em up (again), pick out a few colors for pop (eye lenses, hoses, etc.), base 'em, and clear coat. I might add a decal or two if I'm feeling froggy, but don't count on it.
That's entirely doable for this week or at the worst, this month. So, even though I'm not fond of batch painting I'm thinking that this may be the way to at least grind through some of the basic minis, and then I can lavish a bit of extra time on the squad leaders, heavy/special weapons' troopers.
Or...knowing me, I can stop at this point and paint some other random mini cause that's what I usually tend to do.
*Mordian's in a class of his own when it comes to batch painting!