So about Secret of the mimic gameplay length

So I've only played for 20 min a going to play it all day tomorrow but. A streamer i watch finished the game in only four hours and most people seem to take around the same amount of time to finish the game. How long did it take you guys to finish the main Story because I feel like it's a bit of faulse advertisement to say it is 8-10 hours long if it's only 4-5h to finish the whole game