depends on the peoples work ethic.ive seen it take 4 people 3 times as long to do the same project as it took 2 people. so stereotypically speaking,if the four people even remotely associate themselves with hippies,and the original 2 did not,i would say 4 days,3 hours and 22 minutes..
if it was government workers it would be one person digging and the other three leaning on their shovels
Well thats just a dumb question, we all know that four people couldn't possibly work together long enough to dig half a whole.
Who said anything about working together? If 2 people dig 1 hole in one day, that means that 1 person dig half a hole in 1 day. Therfore 4 persons dig half a hole in 1 day, so the answer must be 1 day. Right? RIGHT?!!
It does A small hole. If the OP had specified how big the hole was to be.. Then yeah we could work it out. But there is no "half holes" Just like something liquid can't be "80% pure water".