Jenson Button admits he is surprised by the length of Fernando Alonso's new deal with Ferrari after the Spaniard agreed terms on a new contract running through to the end of the 2016 season.

Although Alonso's decision to remain with the Italian team has come as no surprise, eyebrows have been raised about the fact that he has committed for the next five-years, although such a deal isn't unheard of in the sport.

Button however questioned the length of the deal, arguing that five years is a long time in which things could change in F1.

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"That's a bloody long time," he was quoted by Sporting Life. "How does he know what he's going to want to do in five years? That is the thing I can't believe. Why does he need to sign a five-year contract?

"Five years is long. We don't know what's going to happen in five years' time do we? I'm not very good at planning that far into the future.

"It's obviously what he wants, and it's a nice place to be for five years I suppose."

However, one man not surprised by the length of the new deal is Michael Schumacher, who won five titles during an eleven year stint with Ferrari.

"I believe in continuity, I believe that is part of any success, so I am not at all surprised," he said. "I am pretty sure he feels very comfortable where he is otherwise they wouldn't have done that."