BBWWANTSFUCKING - she may want it, but I don't think she is going to get it.
I love BBW's but, sorry not for me.
Plus she is terrible at maths
£60 for an hour, or £150 for 2hrs or 4hrs: £450.
So if some crazy person wants to book her for 4hrs. Why not just ask for 4x an hour for £240, or 2x 2hrs at £300.