Is there a set time for the iqaamah (call immediately before the prayer)?
Question

                What is the time for reciting the iqaamah after the adhaan?.
Praise be to Allah.There is no set time for 
    the iqaamah, but attention should be paid to the following: 
1 – 
If a person is praying 
    alone, or a woman is praying in her house, then it is better to do the 
    prayer at the beginning of its time, apart from ‘Isha’ and Zuhr in the event 
    of intense heat. So you should pray the Sunnah prayer that precedes the 
    obligatory prayer, then pray the obligatory (fard) prayer. That is because 
    of the report narrated by al-Bukhaari (527) and Muslim (85) from ‘Abd-Allaah 
    ibn Mas’ood (may Allaah be pleased with him), who said: I asked the Prophet 
     (peace and blessings of Allaah be upon him), Which deed is best? He 
    said: “Prayer offered on time.” I said: Then what? He said: “Honouring one’s 
    parents.” I said: Then what? He said: “Jihad for the sake of Allaah.” 
And the Prophet  (peace 
    and blessings of Allaah be upon him) said: “When it is very hot, wait until 
    it cools down somewhat before praying, for intense heat is an exhalation 
    from Hell.” Narrated by al-Bukhaari (537) and Muslim (615). 
And Abu Hurayrah (may 
    Allaah be pleased with him) said: The Messenger of Allaah  (peace and 
    blessings of Allaah be upon him) said: “Were it not that it would be too 
    difficult for my ummah, I would have commanded them to delay ‘Isha’ until 
    the last third of the night, or halfway through it.” Narrated by al-Tirmidhi 
    (167) and classed as saheeh by al-Albaani in Saheeh al-Tirmidhi. 
2 –
With regard to praying in 
    congregation in the mosque, there should be enough time between the adhaan 
    and iqaamah for people to purify themselves, come to the mosque and offer 
    the regular Sunnah prayers. 
Shaykh Sayyid al-Saabiq 
    (may Allaah have mercy on him) said in Fiqh al-Sunnah (1/100):  There 
    should be enough time between the adhaan and iqaamah for people to prepare 
    for the prayer and come to the mosque, because the adhaan was prescribed for 
    that purpose. Otherwise its benefit is lost. And the ahaadeeth that were 
    narrated concerning that are all weak. Al-Bukhaari said: Chapter: How long 
    should there be between the adhaan and iqaamah, but no (specific) amount of 
    time was proven. Ibn Battaal said: There is no limit for that except enough 
    to allow the time for it to begin and the worshippers to gather. End quote. 
Al-Haafiz Ibn Hajar (may 
    Allaah have mercy on him) said in Fath al-Baari (2/126), commenting 
    on the words of Imam al-Bukhaari, “How long should there be between the 
    adhaan and iqaamah”: 
Perhaps he was referring 
    thereby to the report narrated from Jaabir, that the Prophet  (peace and 
    blessings of Allaah be upon him) said to Bilaal: “Allow between your adhaan 
    and iqaamah enough time for the eater to finish his food and the drinker to 
    finish his drink, and for the one who has gone to the toilet to finish 
    relieving himself.” This was narrated by al-Tirmidhi and al-Haakim, but its 
    isnaad is weak, although it has corroborating evidence in the hadeeth of Abu 
    Hurayrah and the hadeeth of Salmaan, both of which were narrated by Abu 
    Shaykh, and in the hadeeth of Ubayy ibn Ka’b, which was narrated by 
    ‘Abd-Allaah ibn Ahmad in Ziyaadaat al-Musnad. But all of them are 
    weak, and it is as if he was indicating that there is no proof of a set 
    amount of time for that. End quote. 
Shaykh Ibn ‘Uthaymeen (may 
    Allaah have mercy on him) was asked: Did the Messenger  (peace and 
    blessings of Allaah be upon him) define a set time between the adhaan and 
    iqaamah? 
He replied: 
The Prophet  (peace and 
    blessings of Allaah be upon him) used to offer the prayer at the beginning 
    of its time, except for ‘Isha’. He would look at how the people gathered; if 
    he saw they had already gathered, he would pray it earlier, and if he saw 
    that they were slow, he would delay it, and he would stay in his house until 
    the muezzin came and told him that the time for prayer had come, or 
    sometimes he would go out to pray without being told. 
So the Sunnah is to hasten 
    to offer all the prayers except ‘Isha’, and Zuhr when there is intense heat. 
    But with regard to the prayers which have regular Sunnah prayers that are 
    offered beforehand, such as Fajr and Zuhr, one should pay attention to the 
    people’s situation so that they can do wudoo’ after the adhaan and offer 
    these regular Sunnah prayers. End quote. 
Majmoo’ Fataawa 
    al-Shaykh Muhammad Saalih al-‘Uthaymeen (12/190). 
If the congregation of the 
    mosque agrees that the iqaamah for prayer should be given at a certain time, 
    or that is done at the direction of the awqaaf authorities, so as to avoid 
    disputes, there is nothing wrong with that and it should be followed. 
And Allaah knows best.