I'm Puerto Rican and understand it perfectly. "Larguisima" translated into English is "very long", which seems to be the amount of time Madame Foster will be at the fabric store. Looks like Bloo isn't going to have much fun
I must say that it sounds like a good premise... but I really hope that it won't have any predictable cliches where certain characters are barred from riding for being too tall/short/young, or worse, do the incredibly lame "someone ruining the trip for everybody else" twist AGAIN.