The UK's small business owners are working on average the equivalent of an extra eight hour day every each, equating to 52 days overtime a year, according to lender Everline.

The survey of more than 1,000 small and medium-sized enterprise (SMEs) owners and directors found that a third 33% work up to 10 hours overtime a week, while one in 10 work between 10 and 12 hours.

The common time for small business owners to be switched on outside of normal office hours is between 8pm and 10pm, with just over a fifth (21%) quoting this as the time they're most likely to be logging on late. Over half (57%) admitted spending their weekends playing catch-up on work, while 14% are early birds, logging out between 6am and 8am.

Checking and replying to emails was the most common out-of-hours activity, favoured by three quarters (75%), while just over a third (34%) spent the time on finance and accounting. A further 29% said they spent their extra hours calling clients, confirming working culture in the UK is no longer 9-5.

Russell Gould, COO at Everline said: “Small businesses are often touted as the backbone of the economy and it’s clear to see why. As our research shows, they’re so committed to making their business fly that they’re prepared to work a six day week to make it happen. With the UK economy benefitting from 5.4 million businesses in the UK, generating a combined turnover of £1.75 trillion, small businesses deserve our support, whether that’s access to finance to aid their growth, a reduction in red tape or initiatives like the Enterprise Bill’s late payment tsar.”