If your film is fresh, I don't think it will be an issue. I love traveling with Pan F+ because I'm never worried putting it through the x-ray machines. I've waited more than two weeks before developing and see no difference.

It's worth noting that I've found Pan F+ is very sensitive to agitation at least in the developer I use (HC-110). If you're worried about a loss in contrast, I would think an extra 15 seconds of agitation would make things pop.