Winter break can be capitalized, or lower case. If, on a calendar, you are writing winter break, then you would put "Winter Break". On anything else, it could be "winter break", "Winter break", or "Winter Break".
2 or 2 1/2 weeks long.
Winter holidays are two weeks long in France.
There is no winter break in football.
336 hours are in a winter break.
Handball-Bundesliga was created in 1965.
Basketball Bundesliga was created in 1966.
Rugby-Bundesliga was created in 1971.
Fußball-Bundesliga was created in 1963.
Eishockey-Bundesliga ended in 1994.
Eishockey-Bundesliga was created in 1958.
Eintracht Frankfurt was the German Bundesliga in 1959.