1. Reset your simulation setting

Control Panel -> SPICE -> Reset to Default Values
Control Panel -> Save Defaults -> Reset to Default Values
Control Panel -> Hacks -> Reset to Default Values

2. Run the circuit files(.cir) with LTspice.
The simulation time is reported in the error-log file.

From the menu in LTspice:
View -> SPICE error log

3.
Go to our "Database" and add your numbers into the existing
database: "PC Speed Benchmark running LTSPICE circuits"

http://tech.groups.yahoo.com/group/LTspice/database

Helmut