Depending upon wind etc, it took me in my 30' boat 3-4 hrs to round hat island from the everett marina. I'm not sure how much farther north and east langley is, but personally I would figure being back in everett around 3-4 pm vs 2. Or possibly later if you sail and the wind is down.......
If you can find a boat name slow flight, talk to Skip about how long it takes to get places in a C22. He sails his single handed alot. The folks at milltown sail club should know how to get ahold of him, and have how long it may take too.
She drives me boat,
I drives me dinghy!