He has also written the same Mahabharata in different lengths.
He Compiled the Vedas.
Just to have an idea of ho voluminous the Mahabharata is see at the end of the post.
No look this epic of 1.8 Million words in just about 93 Sanskrit Letters!
आदौ पाण्डववधार्तराष्ट्रजननं लाक्षागृहे दाहनं
द्यूते श्रीहरणं वने विहरणं मत्स्यालये वर्धनम् ।
लीलागोग्रहणं रणे वितरणं सन्धिक्रियाजृम्भणं
भीष्मद्रोणसुयोधनादिमथनं एतन्महाभारतम् ॥
“Adau Paandava DhaarthaRaastra Jananam LakshaaGruheDahanam
Dhyootha SreeHaranam VaneVicharanam MatsaaLaye VarthaNam
Govinda Priya BhaashaNaadi Phalitham SandhiKriyaaJrumbhanam
BheeshmaDrona Suyodhanaadhi Hananam ChaitanMahaBharatham”
(With) the birth of sons of Pandu and Drthrashtra and (failed attempt) of burning alive Pandavas) in a wax house, Wealth grabbed illegally, exile in forests (of Pandavas), retreat in the house of Matsya (Kingdom) cows stolen and rescued, in battle, Attempts for compromise (between the Pandavas and Karavas by Lord Krishna) failed, Bhishma, Drona Duryodhana and others killed, is MAHABHARATA..
Its longest version consists of over 100,000 shloka or over 200,000 individual verse lines (each shloka is a couplet), and long prose passages. About 1.8 million words in total, the Mahabharata is roughly ten times the length of the Iliad and Odyssey combined, or about four times the length of the Ramayana. W. J. Johnson has compared the importance of the Mahabharata to world civilization to that of the Bible, the works of Shakespeare, the works of Homer, Greek drama, or the Qur’an.(www.crystal Links.com)
Vyasa wrote two versions, one is the Bharata Charitra and another is The Mahabharata which is popular.
4.Vyasa wrote The Mahabharata with sub-stoiries in 100, 000 slokas for Mankind,
He also wrote it in 24, 000 slokas without the substories.
He wrote again in a compact form containing 150 slokas,
This is called the Anugramanigathya and is in the First Parva.
4.Vyasa released further editions of the Mahabharata.
One for the Deva Loka with 300000 slokas.
Another for Pithr Loka with 150000.
With 1400000 for the Rakshasas and Yakshas and 100,00 for humanity,