Assuming that the generally suggested price of $5 per 15 minutes of work remains true (from the good old days when everything had to cost only $5), that’s about $1 per 3 minutes of work. Let’s assume this is sufficient time for working on one image (it might take longer, but we’ll deal with this as the example here).
If every image costs $1 to work on, and you are asked to removed backgrounds from 200,000 images, you should absolutely require the work to cost at least $200,000.
If it takes 3 minutes to complete each image, that’s 10,000 hours required… and just under 417 days to complete the work. So, can you do it in 24 hours… nope. Not even close.
Even if it took 1 minute per image, 200K images would still take 139 days to complete.
So, yeah… I’m going to go out on a limb here and say that math probably isn’t your forte.