You can account for this by identifying timed actions. For example, when completing a form, the person is informed, “you have 15 minutes to complete this form”. It is recommended that the option of additional time should be provided for timed actions.
Where there are time limitations and time-outs ensure that it is possible to request more time. Consider if a person is likely to have to locate or prepare information to enter on a form.
If a time-out occurs, try to ensure that users can restart the process without losing the data they have entered.