Actual hours operated by a typical S/O are about 60 hours per month.
However, only 1/2 the actual seat hours may be logged towards a licence upgrade. Assuming that the S/O spends 1/2 the typical flight time in a seat with a forward view, he/she would be allowed to log half that - so, about 15 hours per month towards a higher licence.
Take a month off for vacation, that leaves 135 hours per year logged time.