Question: May Allah be good to you, is it allowed for the one in ‘Itikaaf to go out to his work then return to his place of ‘Itikaf another time?
Answer: “If he stipulates that and his leaving is only a little. As for him going out to his work and returning, then this contradicts/opposes ‘Itikaf except if he stipulates to make ‘Itikaf in the night only or outside the time of his work. If he takes an oath to make ‘Itikaf outside the time of his work, then there is no harm as you heard. If he stipulates this, then there is no preventative. If he stipulates that he will do it outside the time of his work. Yes”.
The Permanent Committee also mentioned that a person shouldn’t go out to work when in in ‘Itikaf: [http://www.alifta.net/
They also mentioned someone can do ‘Itikaf only during the night as the Shaikh said above: [http://www.alifta.net/Fatawa/
Faisal bin Abdul Qaadir bin Hassan