I'm a GP, and I almost always run late, sometimes up to 45 minutes but usually about 20. I arrive at work on time and I don't do anything other than work, no personal phone calls or anything.
I'm very thorough and cautious, as I'm concerned that I may make mistakes and miss things if I don't cover all bases.
I've been there nearly 20 years so many patients know me well and want to confide a lot in me, which takes time.
I see depressed people quite a lot, and when someone tells you they're struggling to see the point in living you can't really hurry them out after 10 minutes.
Also, don't forget that after you leave the room the GP has to write a full and detailed account of your history and examination findings, they have to fill in forms for blood tests, X-rays etc, make to note to dictate a referral letter later if necessary. All these things take time. Accurate and detailed notes are essential in this climate of litigation.
And the bugbear for all GPs - the patient with multiple problems. No matter how many signs there are in the waiting room saying "one problem per appointment" people very very often try and sneak another couple in. They say "I know it's meant to be one problem only, but while I'm here can you just have a look at my dodgy knee?". This can add another 10 minutes to the 15 they may have already had. Of course they GP can refuse to deal with another problem, and we often do. But then we run the risk of being complained about. And often the "while I'm here Dr" problem can actually be the most serious one. People will spend 10 minutes talking about their sore toe, then mention as they leave that they've been coughing up blood for a few weeks and have lost 4 stone in weight, which obviously can't be ignored. Sometimes it's lack of medical knowledge that makes them unaware of which symptom is most serious. Other times it's fear that makes them hesitate to mention th symptoms they know is worrying.
I think all GPs running late should apologise, which I always do. But it really irritates me when patients reply "yes well I was beginning to wonder if you'd forgotten me" or some other smart-arse reply. As if I've been sitting painting my nails instead of seeing them.
The fact is that medical conditions are complicated, some are quick to sort, others aren't, and doctors never know what the next patient may have - a flea bite or a brain tumour.