"I would have laughed if anyone had suggested I would still be here in 12 years' time when I took over at Arsenal in 1996," said Wenger.
"But in all my time here, I've never even come close to leaving. I have been offered the chance to go but I never considered it.
"And the longer I stay, the more difficult it becomes for me to envisage working for anyone else.
"The plan at the moment is to go at the end of my contract in 2011 and then have a serious look.
"You don't want to go on for too long but you never know what is going to happen.
"The one thing I have learned in life is you must work as if you'll spend your career at one club, while accepting it can all stop the next day.
"That's how life is. You expect to live for 100 years but can die in a minute."
Wenger added: "Long-term management requires stamina and a special strength in your own motivation.
"I have the desire to go on for a long time but I am also conscious that my strengths could go at any time."