Would probably depend on how the author of the system went about things. For example, are there seperate Update and Draw Methods/Functions? Is there an option to supply a delta or tween value to the system? Failing that, it may have to be done by brute force and the code modifed to suit your needs (provided you can see the code).
If you have a particular system in mind, then try contacting the author, as they'll be able to provide the answers you seek. If their system doesn't have any timing methods built-in then you could always request it, as it would be in their best interests to provide this functionality.
If you have a particular system in mind, then try contacting the author, as they'll be able to provide the answers you seek. If their system doesn't have any timing methods built-in then you could always request it, as it would be in their best interests to provide this functionality.