Is there any log that shows the how long synchs take? We had a record updated in Salesforce that didn't show in Marketo for over 24 hours.
Trying to determine in the synch took that long.
There are workarounds like looking at the time created in SFDC vs. Created in Marketo.
If you were running a batch, you can check the Campaign Queue, although it's not always perfect.
You can also go to Marketo Support to ask them.
There is a secret tool if you are logged in and append your base pod: