Processing time for 221g for l2

i have applied for l2 visa ,my interview wAs on 8 January 2018 . In interview interviewer gave me 221g white form and asked me to mail some marriage photographs . I have mailed the same on same day .its. Been 4 days I didn’t get any reply from them . What should I do now ?

9 - 45 days from date of L-2 interview