If only all our companies weren’t run by the same monoculture of ivy grads with the same excel sheets taking orders from the moves of the Fed.
is there like a market where i can buy a couple of years, new in box, to add to my life
X will take 48 person-months to complete
48 person months is 48 months with 1 persons 48 person months is 24 months with 2 persons 48 person months is 12 months with 4 persons etc
When time to market is critical, companies will often choose to "buy time" by paying people to cut the time requirements. The math isn't as linear as I've suggested, but most of the time, for most of the projects, you can increase velocity made good by adding people to a project.
If only it were that simple: https://en.wikipedia.org/wiki/Brooks%27s_law
Basically: between the added communication/management overhead and the training/ramp-up needed, "buying time" this way can end up costing time. If more of these MBAs calling the shots read The Mythical Man-Month we'd have a less schizophrenic economy and maybe even world peace.
if they can keep from fighting
There's a lot of nuance around whether or not adding folks to a project will make it faster or slower, and that's what the book is emphasizing. It's not a hard and fast rule of "don't add people to a project".
The parent's comment didn't have any of that nuance. Just "more people can help spot errors and help with design" and the only issue they mentioned was "if they can avoid fighting". Neither of those things are what the book describes.