How do yall learn for so long at once

Ello something thats been on my mind for a while is, how can yall study for hours on end each day. I saw some1 saying that they study like 4 hours a day. How?! I have a schedule thing I do and I dont how long it takes me each day, it varies. I usually take one CI vid for a 2 weeks which i watch everyday, the first week I watch and write down the words that I dont know. The second week I js watch it on repeat so that the new words stick. I also take 4 or 5 pages a week 1 page per day of a book or light novel in my TL and same thing write down the words I dont know, read aloud for reading practice. Have 2 30 mins tutor sessions a week and chat w my friends from my TL and again write down unknown words. This maybe take 30 to 60 mins a day. After I've done what I said and what not, im done for the day bc idk what else to do without overwhelming myself. So tell me pls what yall do to study for so long and like your daily schedule or wtv. Maybe I can implement some of it to my own schedule