SQL Profiler Audit Logout duration 18446744073709548
I currently see the same duration for Audit logout, among other similar values. For the same SPID, I would expect this number to increase monotonously, but that is not the case. A few subsequent values:


0
3
6
2616
0
49530
196
18446744073709548
18446744073709545
18446744073709541
18446744073709548


(duplicate values omitted)

I did not arrive here by searching for that number, so presumably, these numbers occur frequently. 

If it were a duration in ms, this would correspond to a duration of over 584942 years. The only machine I have heard of running for that long is Deep Thought, but that machine is definitely not hosting my SQL Server databases.

My assumption is that somehow, the durations of individual batches are subtracted from the cumulative duration, causing an unsigned long to wrap around. 
2^64 = 18446744073709551616, which is very close to 1000 times the numbers we encounter. So, internally, the duration is probably stored in µs.

So, this seems a bug, but I do not think it will learn you anything about the performance of your batches.

I am running SQL Server 12.0 and profiler v17.9.1.