I think most of them would hope for a steady and decent wage each month.
I think their basic pay would struggle to reach £800 pm. (£11,000 pa) so I doubt any of them would see it that way.
We are talking about predominantly young people here, hardly likely to budget their very low wages in that way.
Plus it is not 900 hours of allowances as they do get paid for all the time they are away but it is still a low total even if you include their allowances and their bonuses for not going sick, and performance etc.etc.