Some take 3-4 days. Some say warmer water temps can speed the process, but warmer temps can also make bacteria more virulent, and fungus attack faster, both of which can be problems for wrigglers.
When their yolk sack is used up, they will start to swim, its not about knowing how.
You need to be ready with first foods as soon as they start to swim, and feed frequent small meals throughout the day. Also having a good crop of algae on the glass and decor for them to graze on helps.
Sometimes it is best to remove the male as soon as they start to swim (usually do), sometimes they male helps guard.