As you can see from Teo1904's Twitch overlay (below) It took the tween 138 hours to get from the level of D2R Items. It becomes more difficult to reach higher levels as you progress, too to complete the final stage to reach 99 took more than one day. Teo1904 says he had 34 hours of restful sleep during the long marathon.
It took the streamer around eight days before he reached level 99, which is equivalent roughly five hours of rest every night. Credit to him for catching some winks, though. We've seen Apex Legends and League of Legends streamers rise to a maximum rank of zero on single streams, and it's brutal.
Teo1904 did not reach the milestone by himself, though. The streamer had some help from his friends MacroBioBoi, BTNeandertha1, Rob2628, Jymnasium, Raxxanterax, and others, with the team making use of various strategies to enhance the grind. One of the most poignant facts, however, is from the name of Teo1904's character. As MacroBioBoi explained on Reddit, the 'Unsullied' in 'Teo_Unsuillied' references a beloved friend who unfortunately passed at the end of last year.
If you've been a bit out of playing, you're missing out on seasonal Ladders are basically Diablo 2 Resurrected Items competitive feature. It's a chance to get on a new server with a brand-new character to battle against others in various modes that include a leaderboard. Also, there is Ladder-specific content like the latest Rune Words, Horadric Cube Recipes and more.