How much time

Hi, I am completely new to accounting – I sat F1 in January this year but have been unable to do any further study until now due to work commitments. I am trying to start F3 but only have three hours a week study time available due to work commitments. my work is nothing to do with accounts – i work in the nhs. how many months would it take to complete f3 based on study time of three hours a week and no prior experience? i would be grateful for any suggestions. all the best.