It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to Sayyiduna Bilal (may Allah be pleased with him): "O Bilal, when you give the adhan, give it slowly, and when you give the iqamah, say it quickly. Leave between your adhan and your iqamah as much time as it takes one who is eating to finish his food, one who is drinking to finish his drink, and one who goes to relieve himself to finish relieving himself. And do not stand up until you see me." (b) Imam al-Bukhari (may Allah have mercy on him) said: Abd al-Mun'im is munkar al-hadith (his narrations are denounced), and Yahya bin Muslim al-Bakka' al-Kufi was declared da'if (weak) by Yahya bin Ma'in.
It has also been narrated with another chain from al-Hasan and Ata from Sayyiduna Abu Hurayrah (may Allah be pleased with him), but it is not well known.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2008