I will be in Denmark soon and I was wanting to apply for a tourist visa to UK from Copenhagen.
What is the duration the embassy will need to give me a visa. Usually it says 2 weeks, is it reliable?
In October 2014, the British consulate in Copenhagen decided 100% of all General Visitor applications within 15 days. They report an average of less than 10 days. These figures would be strongly indicative of what you can expect in December 2014 and January 2015.
If you are only in Copenhagen for 16 days, it's possible, but cutting it close. You may wish to see if you qualify to use one of their premium services.