Dan Hauser, co-founder and Vice President of Rockstar, told everyone in an interview that the gameplay of this game takes about 65 hours. But, unfortunately, it remains unknown whether this number of hours includes only the main story or additional missions.
There are official data that revealed the average time of passing the game in 2020-46 hours and 41 minutes. Therefore, the data at 65 hours from the Vice President were announced together with the additions. If you want to quickly complete the game, then count on this time.
If you are a perfectionist, then the average time will be 161 h. 26 minutes – the main story and additional tasks.
Also, several hours of the game were cut out at the end of development. As Hauser said, this content did not work for technical reasons and was unnecessary. He also gave an example of what was deleted. It was also removed the task with the train, there was to deal with the bandits, at first the mission was interesting, but then it became not very exciting.
Each player has their own time, but it is best to try to pass not as quickly as possible, but qualitatively. After all, such good games are released very little!