United appointed Ten Hag in April 2022 to succeed interim boss Ralf Rangnick.
The team sit third in the Premier League, eight points behind leaders Arsenal, and have the chance to win their first trophy since 2017 when they face Newcastle United in the League Cup final on February 26th.
"I always think about the long term, in every club where I was, I have been thinking about long-term work to build a culture, to build a way of playing, to develop the players and the team, obviously," Ten Hag told reporters.
"I think in the long term obviously in contracts and in (transfer) windows because I think that is the (right) way.
"I am not here for one year, I am (here for) longer, I see it is a long-term project to build here and how long it is you can't see, I can't tell," he added.
United are due to host Leeds United in the league later on Wednesday.
