Is there any limitation for the project length?

Same as CrazyTalk Animator previous version, the default length for each project is 2,000 frames and the maximum frame number that can be set is 27,000 (15 mins). For better performance, it's good to break your projects in less than 5 mins and later use an external video editor to merge and compose your work.

To adjust the length of project, just go to menu "Edit" -> "Project Settings (Ctrl + Shift + P)".