If you want to express that someone talks too much in Spanish, you can say, ‘hablas demasiado’. This phrase directly translates to ‘you talk too much.’
In this expression, ‘hablas’ is the second person singular form of the verb ‘hablar’, meaning ‘to talk’ or ‘to speak,’ and ‘demasiado’ means ‘too much.’ This is a straightforward way to convey your message, but remember to consider the context and your tone, as it can come off as rude or blunt if not used carefully.
You might also say ‘tienes el don de hablar mucho’ which translates to ‘you have the gift of talking a lot.’ This can be used in a more playful or teasing manner.