In most cases, we don't recommend diving underwater for any more than 2 minutes with a full face snorkel. Even if you are an experienced snorkeler who is going out in perfect conditions, we don't recommend diving for more than 2 minutes.
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Essentially, snorkeling is a surface sport that involves mostly floating and requires very little (if any) actual swimming. Plenty of non-swimmers snorkel all the time, still, it's important that you know how to do it right and prepare a bit ahead of time.
Choppy waters are not ideal for snorkeling, especially; if you're not a proficient swimmer. Wavy waters will bounce you around, and you'll experience diminished underwater visibility because of increased moving debris and sand. Waves also influence the ease and safety of getting in and out of the waters.