Image forming apparatus

An image forming apparatus comprising:

• a power saving control portion configured to shift a state of the self-apparatus to a power saving mode where power consumption is lower than in a standard mode, if a duration of an event wait state for which occurrence of an operation event including reception of a new job regarding image formation is waited for has reached a preset power saving shift set time;
• a return control portion configured to shift the state of the self-apparatus to the standard mode if the operation event occurs in the power saving mode;
• and
• a power saving shift time extension portion configured to temporarily change the power saving shift set time to a longer time if a predetermined extension condition is satisfied, wherein
• the extension condition is a condition including occurrence, with a predetermined frequency, of a situation where a duration of the power saving mode at a time of state return or a target parameter value satisfies a predetermined short-term return condition,
• the time of state return is a time when the state of the self-apparatus is shifted from the power saving mode to the standard mode by the return control portion, and
• the target parameter value is a value of a parameter which changes in accordance with the duration of the power saving mode.