When Final Fantasy VII Remake was first announced, the fans assumed that it was going to be a remake of the entirety of Final Fantasy VII. Square Enix later revealed that Final Fantasy VII Remake would only cover the Midgar section of the original Final Fantasy VII, but that it would be expanded to the length of a full game. This caused some concern among the fans, as the Midgar section of Final Fantasy VII only lasted for a few hours.
Now that we've finished Final Fantasy VII, we can determine the average playtime based on different factors. Assuming that the player doesn't skip cutscenes and tackles most of the sidequests in each area, then they can expect to play for around thirty hours. If they skip cutscenes and quests, then they can easily shave this down to the twenty-hour mark.
If the player goes for a completionist run and finishes all the quests & battle challenges, then the game can easily be stretched to fifty hours or more. Once the player finishes the game for the first time, they will unlock the Hard difficulty, which they will need to finish to unlock all of the trophies in the game, so the completionists can squeeze a lot more time out of the game, as well as those who are just looking for a bit more challenge in the combat.
Final Fantasy VII Remake will be released for PlayStation 4 on April 10, 2020.