The Tigers currently sit tenth on the Premier League table.
Bruce said: "I'm delighted to be 10th. But as I've said repeatedly though, we're only halfway through. The challenge is whether we can stay the course.
"In the first Premier League season here it went wrong after Christmas. But we can see how far we have come in 18 months. To make nine changes at Middlesbrough last week and beat them so comfortably proved how far we've come. The aim is to keep it going. We don't want to be a six-month wonder."
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