Sequence: get total length in seconds

When using sequence:getLength() I get the length of the Sequence in "steps" as documented.

For a sequence that is roughly 67 seconds long, that value is 15459. How can I get the total sequence length in seconds?

Perhaps (steps/tempo/2)? (just trying to make the numbers fit, not based on theory)

Also: is there a maximum length for a sequence? And is that in seconds or steps?

My use case is an midi mastering tool used by musicians to check and adjust instrument parameters on hardware. Adding files to the data folder is easier than compiling them into the game with pdc.

And another synthesiser question: what are the default values for attack, sustain, decay, release?