Depends on your business circumstances and management needs, accounting work can be performed monthly, quarterly, semi-annually or even annually basis.

When the accounting work is mainly for the purpose of Profits Tax Return filing, time to perform the accounting work shall be 15 months after the company incorporation date (since the 1^st Profits Tax Return will be issued by the Inland Revenue Department some 18 months after the company incorporation date).

For example, for a company incorporated on January - 2010, 1^st Profits Tax Return will be issued to the company around June - 2011.
In that case, the accounting work shall be started to perform at the end of March - 2011.