Well, since we have the same stove, the only variable is Draft, uhh...wood we're burning...install, well...nevemind...we're about as close as anyone around here...
This time of year I rarely stuff a full load in. What ever it is in the morning it is....the house usually isn't cold.
If it's very cold out, I begin planning ahead around 8pm or 9. I prep the stove by getting a good bed of coals, but not too deep..maybe 2" of coals or so. Up to the front metal "chin" that the Osburn has.
Then I put in as many splits as will fit, and believe me....It's an art form. The bigger the splits the better since they burn longest. For over night I tend to use elm (Did I ever mention that Elm is natures cruel joke?) white oak or ash. (Yes, I actually have my wood piles seperated by burn time.) Elm, oak, and apple on one set of pallets, then cherry and ash on another, followed by the S**t pile which has a mix of pine, crappy apple, cedar, mulberry, etc... and finally about 2 cords of pure pine.
By the way...I'd be happy to get rid of some of the pine if anyone in Poughkeepsie wants some. All split and ready to burn. I just have too much of it.
I usually load the stove around 10:30pm and run it wide open till about 11:00 and shut the air down as far as it will go.
No matter what I always have enough coals in the morning to light off the next mornings fire.
A 2200 would be a better stove for my home, but I'm pretty happy with my 1800i
For what it's worth...it's 80 in my LR right now...about 40 outside.