NTP really required for local mini-cluster?

[Casey Ching]

For Impala development we setup a 3 node kudu "mini-cluster", with all process 
running locally. Is NTP really required in this case? Some people didn’t have 
NTP installed on their dev boxes. But if NTP isn’t needed maybe we can just set 
—max_clock_sync_error_usec to a high value?