Recently, the ratings for standard games have been divided into 3 categories called "bullet", "blitz" and "classical".
I think that "slow" is a more appropriate name than "classical".
"Slow" is a general category that encompasses a wide range of times whereas "classical" is a very specific time of "slow".
"Classical" is 2 hours for 40 moves, 1 hour for the next 20 moves, then, I believe , 15 minutes and per move increment for the rest of the game. That is classical, a very specific type of slow.
But, here, "classical" currently means any game with time greater than 8 minutes and I think that "slow" would be a more appropriate name.
Technically classical is any length of time you like, but usually where there was no specific time pressure (i.e. untimed). FIDE and the codified rules it brought to the game is, in the whole scheme of things, relatively new, it hasn't even reached its first century yet. In fact, it's only five years older than the CCLA, so the time controls used there would have about the same kind of weight and authority. How does 10 moves in either 40 or 50 days grab you? No? Oh well.
The fact is, Thibault can define classical any way he likes on this system. Though I can see an argument for everything between around 8 and 60 minutes being re-classified as rapid and everything above an hour being classical.
I see - 8 to 60 minutes should be considered rapid - and 60+ classical, like you suggested. There is a big difference between 8/0 and 90/30.
The skinny of it is that we can define the time ranges however we like. This is online chess, not OTB, the average game is very short. So to make the divisions still relatively granular we've made classical start at relatively short time control levels.
If we made Classical 60+ minutes, there'd be next to no games played in that category, and you'd be strictly using bullet and blitz ratings 99% of the time, making Classical redundant. Games over 30 minutes already count for less than 2% of the games played on lichess.
But I can see a good argument for Classical being renamed to Rapid, which shouldn't be too hard change. Bar that, it's unlikely that another category will be added for games over 60 minutes as they are so sparsely played.
Amendment: RATED games over 30 minutes count for about 0.3% of all games.
Yeah, best leave it until there's whole percentages to work with.