I'd like to make sure a natural phrase to express the following my situation.

I visited a store with my friend lately. I finished my errands soon, but wasn't sure whether my friend wanted to see and purchase something more or not. I asked him what he is looking for. He didn't say clearly and time passed more than 45 minutes there. I was so irritated this situation. I described my friend as below. Is that natural?

"He spent chilling out there."

I was wondering if you could give me any advises.

Question

I'd like to make sure a natural phrase to express the following my situation.

I visited a store with my friend lately. I finished my errands soon, but wasn't sure whether my friend wanted to see and purchase something more or not. I asked him what he is looking for. He didn't say clearly and time passed more than 45 minutes there. I was so irritated this situation. I described my friend as below. Is that natural?

"He spent chilling out there."

I was wondering if you could give me any advises.

Answer

Howdy Yoichi!
No, this would not be a natural way to describe the situation you experienced. “Chill” is usually used to describe times of relaxation or ease. It generally has a positive connotation. For example “We didn’t do any sightseeing on our trip, we just chilled by the pool”. For your experience I would perhaps say something like: “He was in no hurry” or “He took his own sweet time”.