How likely is it for an affair to develop between a man and woman who work extra time together alone?

I’m asking this because my husband has started working on a project with a hot woman from work. They spend 1-2 hours alone together per day working on it and this will be for the next few weeks. Is it possible that they can just keep things platonic? Or could an affair start?

How likely is it for an affair to develop between a man and woman who work extra time together alone?
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