We use this form when we want to know how long something has been going on for. For example, I'd say to you: How long have you been living in Tuscany? How long have you been studying English? How long have you been working for this electronics company? These are things that you started doing in the past, and that you are still doing now.

No. You need continuous verb aspect (verb+ing). How long + have/has + subject + verb+ing ?

Is it ok if i say "How long have you played football"?...