Wow, that's quite a bottle! I was in a whisky bar last night and I don't think they had anything that big. Maybe it's some sort of catering size.
I know @dickturpin is partial to Bushmills.
A normal whisky bottle lasts me a fair while, but I do have a few on the go.
Hubby's seems to last him quite a while, and he normally has quite a few stashed away. In fact I might go and check out his collection, I don't normally poke my head in his whisky cabinet
Between us we have a fair few whiskies and gins. It's a good thing they keep well.