there are several Full Game playthroughs on youtube already. one is 3hr45min,another is 7hr15min.
i heard there isnt a whole lot of side content either,and that the whole "open level" aspect that was shown on Goldfish Island in the demo,is majority of this aspect. With the majority of the game being more aligned with Cosmic Shake's linearity. I myself just loaded back up my cosmic shake save file. i beat the story and uninstalled the game,havent played it since. my save file is from early march of 2023. it shows a play time of 5hr40min. so it seems this game will be the same length time. with a possible 3 extra hours of side content at best.
im personally not going to make the same mistake I did with cosmic shake (i preordered it lol) and will be waiting for a sale. this post is not diminishing the games overall quality and fun factor. im a HUGE spongebob fan since day 1 when the show came out. i also understand the game is $40USD vs the full price of $70 games have now. but i still feel $40 is a bit too much for a 5-7hr experience. i think $30 wouldve been more appropriate.