It could take up a whole day since kids might want to repeat flavored rides.
7 to 8 hours on a non busy day; this includes repeat rides and Lego adventures (non rides).
From 7 to 9 hrs.
About 8hrs
We went during the school year and a week day. We didnt do the lego hotel. Took about 8 hours. Got to ride the rides multiple times without needing to get off the ride. Good all day thing. Suggestion, go eat a huge breakfast, come in all day, then go eat a buffet dinner.
Many of the attractions are not necessarily rides but more of experiences (e.g. free play in the open Lego areas). It depends on how long your child wants to spend on these areas.
7 to 10 hours for sure!
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