If all you are trying to do is to get around the course, what you're doing will work. It is unlikely to be glorious but you should have time and energy to observe what's going on around you and have fun.
That said, you likely aren't challenging yourself with a long run like that. If you think of the range of possibilities for your heart rate (the resting rate is just that - lying in bed - while the maximum is too painful to do for very long), you ended up running in the middle, at an effort that is not that much more than a brisk walk.
Try bumping the pace up to something in the 130 +/- 5 range. If you get to the point where you can do that comfortably, raise the intensity more. Even at a rate of 140, you are only using 75% of your "heart rate reserve". When you race, you should find yourself materially higher than that if you want to run something close to a best effort.
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