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I use a Nest learning thermostat which learns when I want heat and how long it takes to achieve that target, and brings the house up to temperature automatically adjusting the start time based on the ambient outside temperature and time of year. This means in spring it might come on 20 minutes before we wake up whereas it could be more like 2 hours this time of year.
On days when I set it to away whilst my wife and I are both at work then the overall duration the boiler is heating tends to be an hour or two less than if one of us works from home and has it on all day. We tend to be out for 8-9 hours at least so any less than that and you might see a benefit from keeping it on.
I have noticed it takes exponentially longer to heat the house if it drops below 12-13C than bringing it up from a more usual ambient of say 15C.
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