Hair greasy after two days?

Hey guys... I'm currently trying to grow my hair out to a decent length... As yet I'm not too sure what to do style wise, the initial goal was something like Tom Cruise had it in The Last Samurai (http://the-light.com/longhair/images/95919.jpg) but I may go a bit shorter overall with a centre part kind of falling down to about eye level.

Anyway, I've got it to just below eye level and the layers are growing out fairly well... I'm gonna be away from home for about 3 weeks, so I'm trying to get my hair used to being washed less often. I usually wash it every morning and then blowdry it with Garnier 'Fructis Style Smoothing Cream' that gives pretty cool results that I'm happy with, but the thing is I'd like it to be a bit lower maintenance...

The problem is, if I leave it for 48hrs without washing it, it gets really greasy feeling and looks really flat/lank. Not exactly a great look lol. Is there any way I can avoid that happening? I also find I keep getting it wet when I wash my face at night, and then dries in awful shapes when I wake up in the morning.

My hair is fairly naturally thick and wavy but can really frizz up if it's not really well towel or blow dried.

Any advice guys?

Cheers.

well each person is different. some may have towash everyday coz their scalp is oily some may only need to wash once a week. for you just stick to gentle shampoo since you are washing it often. just tie your hair or clip it when you wash your face to keep it from getting wet