When waiting for a download, upload, etc. and the amount of time on the loading bar is different from the amount time it actually takes to download.
Similar to microwave minutes.
Dexter: "Oh my gosh Jocelyn, I was trying to download 'X-Men First Class' and the loading bar said two minutes, when it actually took fifteen!!"
Jocelyn: "Oh man, I know, internet minutes always fool me."