And dont forget that in the increasingly joint world, you may have to go to sea for months on end, and its not unknown for ships to deploy in May, planning to return in July, but not actually getting back until October etc.
And then, later in your career, there's the staff course, with all the work that entails.
Or very long hours in a staff job in the MoD or PJHQ etc.
I was RN rather than RAF but wouldnt have missed it for the world. Fortunately my better half was OK with all that, but its not easy and if she doesnt like it now, it wont get any easier.