Rounds in the standard 4 - on - 4 Turf War mode are three minutes long: a seemingly short but perfect amount of time for what the game is. (ibtimes.co.uk)
and was gone for six weeks in total... ended up the exact perfect amount of time, of course. (theprofessionalhobo.com)
Eisenmann believes three months is the perfect amount of time to fully explore the viability of an idea. (fortune.com)