excursion beginning times

I'm trying to plan excursions in St Martin and San Juan. I'm used to other cruise lines giving departure times on the excursion lists which is helpful in planning what you'll have time to do after an excursion. Do the MSC excursions typically begin soon after arrival in port?

Ours varied from right as we arrived to 2 hours later. I think it just depends on how long the excursion is and what you are doing.