Well, you take up an escalator and the queue starts right there with a "15min from here" sign.. it's totally about 20m or so (with "10min" and "5min" signs) but I've never actually had to wait for security. SOF, despite being their capital airport, isn't very busy, so I'd be surprised to ever see lanes of "real" form to be forming - unless you happen to be so unlucky and a 40-people travel group just goes airside before you

That said, SOF is small, fast and easy to transfer.