Just don't put a post centered on the sink.

I would do 6. I also find your island shape intriguing. Do you plan to make the seating part chair height or leave it counter height?

Do you have an inspiration picture?

Another vote for 6'. More is better with kitchen windows.

Thanks everyone! This was easy 6 ft window it is. Regarding the island, should I make the seating area island height or table height? Thanks.

I don't know. I have been contemplating something like this myself. I am not as young as a lot of the folks on here although I am still raising kids and I really find counter height uncomfortable. I like table height. I have looked at a lot of pictures of islands like yours where it drops down to table height. I don't think it looks quite as nice as leaving it all counter height but in the long run, for me it would be more functional and comfortable.

My plan has 2 islands. A work island and a "snack island" and I have seriously thought about mimicking my work island in all ways except making the snack island table height. I can't find any pictures (google or Houzz) where anyone with 2 islands has had one island lower than the other. Sooo, I don't know.

I could do an island like yours instead. May wait and see how it turns out and copy it ;-)

I think it will work eather way. Maybe table hight would be better though.