A typical working day for Singaporean office worker Shamir Osman lasts about nine and a half hours, so packed full of meetings and calls that he sometimes does not even get a chance to eat.The 39-year-old public relations manager’s hectic schedule is far from unusual in the city state, where the average working week lasts just shy of 45 hours – the second longest in the Asia-Pacific, according to a study of 40 cities done by office access control systems provider Kisi.How to avoid burnout: five…