Some people say that span of Sat Yug , Treta Yug , Dwapar Yug and Kali Yug are 17.28 Lakh , 12.96 Lakh , 8.64 Lakh and 4.32 Lakh years respectively.
But recently I have gone though some books and articles on the internet in which different chronology of Hinduism is presented.
Like - In this book - https://www.amazon.in/gp/product/B0846WKRQM/ Satyug is shown to start at 14500 BC , Treta Yug at 6777 BC , Dwapar Yug at 5577 BC and Kali Yug at 3176 BC.
There are multiple such claims by other people as well . Here are some other links that also give similar timelines as above of Hindu history.
http://veda.wikidot.com/hindu-timeline (Satyug starts at 7000 BC)
https://www.youtube.com/watch?v=3tsyzrDg2n4 (Satyug Starts at 15000 BC)
What is the real timeline ?