Hi Kekko1991 Antropoli,
If you submitted a request, using the online service, then it should take around 14 days.
If you emailed a form, then it will take much longer, perhaps a few months.
You can progress chase your request by calling the Self Assessment helpline number: from overseas, dial +44 161 931 9070 (Open Monday to Friday 8am to 6pm. Closed on weekends and bank holidays).
Self Assessment: general enquiries