Sync activities for individual records are maintained in each lead/contact's activity log for changes made to and from SFDC. What exactly is it that you're looking for?
I'm trying to find how long the first sync took to complete. The userID that did the sync is not a lead or contact, it is a user only. I'm also not clear as to where to look for the logs on the Marketo side or SFDC.
.png)