In the UEFA European Championship, each match consists of two halves, each lasting 45 minutes, with a 15-minute halftime break in between. Therefore, the total duration of a standard UEFA European Championship match is 90 minutes.
However, it is important to note that in the knockout stages of the tournament, if the match ends in a draw after the 90 minutes of regular play, it will go into extra time. Extra time consists of two halves of 15 minutes each, making the total possible duration of a knockout stage match 120 minutes.
If the match is still tied after extra time, it will be decided by a penalty shootout, where each team takes turns to take penalty kicks to determine the winner.
So, in summary, the duration of a UEFA European Championship match is typically 90 minutes, but it can be extended to 120 minutes or more in the knockout stages.