Elden Ring Nightreign player count surges to more than 300,000 players in a Hour of release.

Elden Ring Nightreign player count surges to more than 300,000 players in just 60 minutes, eclipsing the entire Dark Souls trilogy combined | GamesRadar+

That's a good start

gamesradar.com

TL;DR: Elden Ring: Nightreign blasted past 250K concurrent Steam players just 30 minutes after launch—hitting over 306K within an hour—and even outpaced the combined peaks of Dark Souls II, III and Remastered. Its multiplayer co-op focus clearly gave it a serious boost, putting it at more than a quarter of OG Elden Ring’s all-time high of 953K.