with any luck
with a bit of luck
with a little luck

With his luck they would get more lost than he was.

With any luck, something would happen to make me change my mind.

With any luck, people might start to understand what I was saying.

With any luck you can be back in a week, two at the most.

With any luck, you two will learn to work together.

With any luck he'd be back on Earth in less than two days.

With any luck, they would be on the other street.

With any luck at all, he'd have a new project car pretty soon.

With any luck at all, he would not have to do anything.

For a very long time, with any good luck at all.