Imam Muhammad Fasi (May Allah shower His Mercy on him) writes in his Matali'ul Massarraat, Pg. No. 322 on the authority of the book of Shaikh Abu Abdullah, Lafzud Durri Bi Anamlil Kaff:
Translation: Which means that Hadhrat Jibreel (May peace be upon him) had the honor of coming to the Holy Prophet (Sallallahu alaihi wa sallam) 420,000 times. Each time he came and waited upon Him with proper respect.