That's what I would expect. I was reading some OCGF owners , that said it took up to 2 hours.
Here's from another site on the OCGF
Here's from another site on the OCGF
This doesn't bother me too much, but the lack of airflow that I have experienced with this smoker is not acceptable. From startup to get up to 275 degrees takes 1-1/2 - 2 hours - even with the fire box door open. I can even deal with this as well, and just start it up earlier, as I really want to love this smoker. The real problem is the recovery time though. My second cook was some ribs, and after taking the ribs out to wrap and put back in the smoker, after an hour, the internal temp was just barely back over 200.