I don't see the point in daily targets because you just don't know how a day is going to pan out. You might have a one hour booking where the bloke just basically wants a snog and a hand job, and another 1h where it's a no-holes barred fuckfest. I also don't think it's wise to burn yourself out making £££ unless it's for a very short, focused period.
Personally I think it's unwise to work during your period. It's only 4-5 days a month, and it serves as a natural break to give your body a rest, focus on other stuff (marketing, for example). It also won't do your reputation any good if punters realise - unless you're offering period play, of course.