Agree with FusionSpy on this one, as a domain it has little value, perhaps development might help although there are a number of companies that already use 4pm as there site/brand.
4pm.com - Project management training & certification
4pm.ie - tech company
4pmEvents.com - events, weddings, etc.
There are quite a few others also.
Anyway, good luck, but definitely think that development is the only way you will add any value to this domain.