Ech - what a thing to have to count. Many of the same ones as Phil barring the first 3 worldcons, add an extra trip for a FilkContinental Phil didn't go to and two SF trips I did on my own, plus let's see, we went on at least one US holiday when I was quite little (2), moved to SF age 5 (1), back when I was 9 (1) and then I had a lot of summer and Christmas holidays there until I met Phil at age 22 so perhaps an extra 20? So perhaps in the region of 85-ish?

Extras for the year when our flight home was diverted to Seattle but still couldn't land there due to the fog so took us back to SF and we flew out again the next day and the year I visited my Grandfather en-route to SF and let's count the flight in the little plane my Dad got one year in a charity auction and I think I might actually just tiptoe over into 90 but couldn't guarantee it.