My friend, there is too much maths going garound...you have the choice to go with your dick or go with your head...if you wish to have a 5 days GF vacation, you'll need to take her as if she is your GF - which means being bloody generous. No GF would let you do her like this and still have any feel during day time:
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2 times per night, total 8 times ...., 4 aeroplanes+body ...., 4 mouth .... + gf feeling at day time ....
Oooh by the way, you missed the cost for yourself and tips for the tour guide...plus out of the pocket food/entertainment not included in the tour package.
For that money, may consider 包个二奶 for few months....
I think Mainland BG is willing to be 包 for 1 week for much less and their service attitude is much better. 迷暈湯都特别好味。