Hi Djelo,
benign file with 60 seconds can be easily explained by the maximum emulation time setting which is set in the GUI config. The emulation will last for 60 seconds in general so including some preparation before and after you can expect an on-premise emulation time at around 60-90 seconds for a file that needs to go into emulation (on a properly sized emulator). For "average" you have to take into account that 30-60% of files are checked but never go "into" emulation because of e.g. local cache hit or static analysis. Therefore the average time can be below 60 seconds.
For malicious files we re-emulate exclusively at least once and maximum up-to 4 time. So you can expect a verdict in between 2-4 minutes.
Regards Thomas