The investigation, to be conducted by a third party firm independent of UBS, will focus on:
the details of the unauthorized trading activity,
the control failures which permitted the activity to remain undetected and
will include an assessment of the overall strength of UBS's controls to prevent unauthorized or fraudulent trading activity in its Investment Bank.
At the moment no indication can be given with regard to the duration of that investigation.
Source - The Swiss Financial Market Supervisory Authority