It is difficult to answer this question because it depends on how complex your tax return is. If all authorisations are in place to engage clients, the average time for an accountant to complete a return tax is about 3-5 hours. The time it takes to file your tax return for your accountant will depend upon how long it takes them to gather the required completed  documentation and analysis. It may take an average of 2 to 3 weeks for an accountant or tax advisor to engage, register and complete a tax return from end to end steps starting from your first interaction. However, this can vary depending upon the complexity of your case. The amount of time that you have to wait for them to send you back your completed tax return will depend on how long they take.