How to change the duration of a Legend?
For now duration stays fix: we chose 6 seconds because it fits nicely Vine. Also it's not possible to manage the speed of the text, this is all done automatically depending on the animation style you chose.
One thing you can do is to stitch Legends together.
If you are on iOS:
You can combine your Legends together using our free iPhone app called Replay
Here's a quick guideline on how to do it: http://help.legend.im/article/66-step-6-combine-legend-and-replay
If you are on Android:
For Android, know that we're working on the Android version of Replay app :)