Twenty five per cent of IT managers work at least 14 hours of overtime every week, according to a survey of 90 IT managers by the Chartered Management Institute (CMI).
Although IT managers worked an average of 8.2 hours more than their contracted hours each week, almost 25% said they had the capacity to take on extra tasks.
IT managers' favoured recommendations to reduce their workloads were compressed working weeks (27%) and flexi-time (16%).
The managers surveyed were more disgruntled by their employers' management structures than by their working hours, however.
Some 37% of those surveyed said flat structures were to blame for their career frustrations. Another 17% said the presence of "old boys' networks" was holding back their careers.
The CMI's research was sponsored by recruitment consultancy Adecco.