Informal:
* Mo tẹ̀lẹ̀: This is the most common and informal way to say it, literally meaning "I'm going for a while."
* Mo pada lẹ́yìn díẹ̀: This is a more literal translation, meaning "I'll come back after a little bit."
Formal:
* Mo ń padà lẹ́yìn díẹ̀: This is a more formal way to say it, using the progressive tense to emphasize the action of returning.
* Mo gbé lẹ́yìn díẹ̀: This is a more formal and respectful way to say it, meaning "I'll be back in a moment."
You can also add a time frame for more clarity:
* Mo padà lẹ́yìn iṣẹ́jú méjì: I'll be back in two minutes.
* Mo tẹ̀lẹ̀ fún iṣẹ́jú méjì: I'm going for two minutes.
The best option will depend on the context and who you are talking to.