Depends how you define 'top', but lets go with most (estimated) hours played:

Minecraft. It wont track my hours, but if it did in the back end and told me I had played 10,000 hours of minecraft, I'd believe it. Yes I'm aware that's more than a year of playtime, I mean what I said. Almost been playing for half my life, I doubt I will ever truly stop.

Runescape, both RS3 and OSRS. They started tracking hours played well after I started playing, but given my playtime for both of these is listed in days, it probably deserves being here. You never quit Runescape, you merely take extended breaks.

League of Legends. This probably wouldn't show up if it were a list of favourite games, i don't know why I still play it. Around 2,000 hours at last check. Help me.

Forza Horizon 5. 600 hours. I did a lot of races. 400 hours in the previous title. Anyone still playing 5 know if the game works properly now? I remember the online being a disaster and the majority of every leaderboard being cheated times.

Warframe. This is going out of order due to the extremely short time I got those hours. At 500 hours, the first 200 hours were in 2 weeks. More games need bullet jump.

Counterstrike: Global Offensive. Yeah that's about 2k hours again. This game has ruined most other FPS games for me because bullet travel time is a bitch and I never learned it.

Stardew Valley. I think all top 10 lists deserve this game, 400 hours. Level 10 fishing in the first spring, never sided with Joja.

Skyrim. 360 hours, although at least 20 of those hours were mid-crash. Unplayable without mods.

Trackmania 2020. Excellent game, ton of fun. Wish it wasn't behind the Ubisoft launcher, this game is the only reason I have it. 300 hours. Obviously learned about the game from Wirtual.

Stellaris brings out 10th, 170 hours. I have no idea how to play the game and I think I need about 500 more hours to maybe get the basics down. And then I'll have to learn all the DLC!

This list did not end up being some of the games I expected it to be. I thought Skyrim would be lower, and I thought Beat Saber would've made an appearance, but only 145 hours of that. This list also skipped idle games because that's just cheating. Apparently I only have 10 games on Steam over 100 hours, that's clearly not enough gaming and I need to fix that. Did I write too much? Probably. But I spent a couple minutes looking up the numbers for some of these so I'm not just gonna not post it at this point.