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How long should beginning and ending titles be in seconds?
Warry gives you some very good pointers. Your opening title sequence and end credit sequence should fit the rhythm of your project. If you're looking for an answer based on television shows that you've watched over the years; then I can tell you as someone who was a television director for 16 years, that an opening title sequence was typically 25 to 30 seconds, and an end credit sequence would be under 30 seconds for a 30 minute show, and under 45 seconds on a one hour show. These days, the end credit sequence is pretty much non existant due to the fact that most networks will 'squeeze and tease'. In other words, shrink the outgoing credits, and hilight the incoming show, accompanied by a voice over. Do what feels right for your project, and read aloud any captions that you put up, so that you know that your viewers have the time to read them. Good luck.