A bitch and a half - A really long time or a really far distance, like you’ve bee

A really long time or a really far distance, like you’ve been walking for hours or running from a monster.

This walk is a bitch and a half. I’ve been walking for an hour and my feet are killing me.

This race is a bitch and a half. I’m running for miles and I still have five more laps.

This trip is a bitch and a half. I drove for six hours and I still have to go three more.