I know how early we can arrive but how late can we arrive with a 4:00 pm departure out of Miami (Valor)? also when are the busiest and lightest times? Don't mind boarding later if it will avoid crowds and waiting.
2:30 - don't know about ebbs and flows. We did a Carnival transfer a few years back and did arrive pretty close to 2, and got through embarkation pretty quickly.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014