You're full of shit clear to your ears...I guess you don't know many QUALITY contractors..If you can't use 3/4 of a pail of mud (ONE bag) in one hour (90) you're a slacker and wouldn't last ONE day working for me unless you're a rookie...Besides they make 210 if it is a cut up job or staging work ...Need me to convert that to hours for you ??? Ok I will , it's 3 HOURS....Try your little fan trick up here when it's zero out and you're using space heaters to heat a LARGE house or it's spring , summer or fall and it's been foggy or raining for a week or longer or humid as hell....Might work in Arizona but not here in coastal New England...Unless it's a commercial job with long flat walls your banjos and boxes are pretty much useless the way they build homes now with all the cathedrals , angles and curves and COMPLETELY useless doing patch work in a renovation..The square box type ranches up here are all modulars now...I can't remember the last stick built ranch...LOL... .Besides the machines take atleast 2 or more to operate them so the man hours are about equal or WORSE...Atleast compared to a REAL taper..If they got the ENTIRE house done in 2 days I can imagine what it looks like...I've seen HACKS like that too...Made alot of money fixing their SHIT work....HTH...