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burnthesheep - Your power sounds about right for that speed.
I long ago developed the habit of at least drinking on a schedule. That's partly, maybe mostly, due to living in the Deep South and having to stay on top of hydration when it's hot and humid AF. I take three hard pulls from the bottle every 15 minutes or so, so I finish a bottle in an hour. I drink less when it's cooler and more when it's really hot - like a bottle every 45 minutes. That gets modified during a hard ride/race, but it's ingrained enough that I'm always looking for a chance to hit the bottle when I can.