Ya know, it's funny you should ask... now that I think about it, haven't sharpened a SAK on a stone in quite a while.
When EDCing a SAK (one of four or so, along with a half dozen other slipjoints, in my EDC rotation), I usually also pack a locking folder, which gets used for heavy cutting, leaving only light duty cutting for the SAK. And I've gotten into the habit of stropping my slipjoints, SAKs included, after use, generally on a plain paper notepad. The relatively soft Victorinox steel hasn't needed anything more than that in months!