Question. what is the process of becoming a UK citizen? If Harry marries someone from another country how long would it take for her to become a citizen?

Good question! regular people it takes years, you are tested in knowledge of history of the England, different steps.

However if one is married to a UK citizen, then the qualifying period is 2 years (this changed to 5 years for spouse applicants after July 2012). For those who have obtained ILR through 5 years residence, they are then required to live in the UK for a further 1 year before being eligible to apply for UK citizenship.….

thanks anon