Hours
I've just finished my first year and I can tell you that in all but two of the past 12 months I have been well into overtime. The first year guarantee is 50 hours but you can usually expect 60 to 70 and in some months more. This is because at this point you are cheap labor. It costs them less to pay you overtime than to pay a more senior pilot overtime. After the first year the guarantee is 62 hours. This month I beat that by 23 hours.
As to the five year F/O I have no idea. I suspect the overtime may be somewhat less but the pay scale probably makes up for that somewhat.