So apparently smartsheet created and modified columns retain time down to at least the seconds, I wasn't willing to keep checking beyond that. I utilized this to report the time difference in form submissions down to the seconds. Just sharing in case it helps someone. Of course you can break this down in any way you want to report the information.
="D:" + INT(Created2 - Created1) + " H:" + INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36) + " M:" + INT((((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36 - INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36)) * 60) + " S:" + INT(60 * (((((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36 - INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36)) * 60) - INT((((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36 - INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36)) * 60)))
Days:
Hours
INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36)
Minutes
INT((((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36 - INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36)) * 60)
Seconds
INT(60 * (((((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36 - INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36)) * 60) - INT((((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36 - INT(((Created2 - Created1 - INT(Created2 - Created1)) * 1000) / 36)) * 60)))