To answer the question, I'm not sure when you can say "I'm from Philadelphia". I think the unspoken rule in NYC is that you live there for 10yrs before you can call yourself a New Yorker. I would say for Philadelphia maybe 7yrs, as long as you've been converted to Philadelphia sports teams... because how can you rep being from Philadelphia if you're not rooting for the city & their teams? Anyone have any thoughts on this?