Well, an hour might have been a bit of an exaggeration, maybe it was about 45/50 minutes. But yeah, putting in a single game in the game log can take about two to as many as five or six minutes depending on a variety of factors. For example, I had to do extra work on the first game that was the rainout because I had to reorder the number of all the games that came after it up until the make-up date.
And sometimes I have to research pitchers' names if I don't know them, often have to disambiguate them if they have a common, ordinary name, etc. .... there are lots of variables. :p