A complete review of personal finances should be done at leat.?

Answer 1

You should review your finances at least once a month. I say this because most of your bills are probably due on a monthly cycle, so you would need to review your situation each month to see how you stand.

Answer 2

Once a year would be my answer. This would allow you to judge if you have met your goals, and allow you time to adjust the next years' goals accordingly.

At this time, a thorough analysis of your spending habits is in order; every one should have a budget to track his/her spending patterns throughout the year. Then, at review time, you can see where and on what, you blew your money on.