It was the first she'd eaten in over twelve hours, and she needed the energy.

I haven't had anything to eat in almost twenty-four hours.

She hadn't eaten in over twenty-four hours, and her energy was flagging.

He glanced at his watch and decided they would eat in two hours.

She had not eaten more than half a sandwich in twenty-four hours.

I felt a bit faint from hunger; we hadn't eaten in twenty hours.

You certainly can't shop and grab a bite to eat in two hours.

If you're just waking up, you probably haven't eaten in at least 10 hours.

Or could you find out how many flies one swallow would eat in five hours?

So one swallow would eat fifty in five hours.