"Aha! I was waiting for you to ask that. I set the robot to detect and take a unit of energy metal each trip!"
"Energy metal?" Veux jerked upright.
"Yes, but they're running out." Tai sighed. "The robot reports he has had to go clear to the other side of the planet to fill his quota. There's only enough scattered around for a few more trips!"
"I guess we can't complain," Veux said.
They clinked their glasses.