Disembarkation Carnival Feb '24

[dmori]

Hello! Looking to book shuttle for return transport to IAH - most likely with Galveston Limo for flight out at 4:30PM in February. Ship arrives in port at 8am. Family of 4 with passports planning to self-disembark with luggage. Shuttle time options are 9:05AM, 10:05AM, 11:05AM. Which would be the best option for a more leisurely disembarkation? If ship docks at 8AM, what is the earliest we can expect to be off? On the flip side, what is the latest to get off? If we choose a later shuttle departure, is our seat guaranteed or is there a chance it will be full and we need to catch the next one? Thanks!