THE LENGTH OF THE VISIT
The length of a visit should correspond with how well you know the host, their circumsances and conditions. Do not overstay your welcome by making your visit too long or burdensome. One should always be aware not to sit for too long, as we may be harming the hosts.
Today many of us neglect this adab and continue to sit for hours, assuming it is okay because we know the hosts well, and are very close to them. This is not correct. Often a longer visit, is of little benefit and increases opportunity for purpose to divulge into major sins of Backbiting, slander and idle gossip.
When visiting someone, there is a fine line between being welcome and harming the host, by over burdening them with requests and demands. Often people are in a hurry and one should seek ijaza for their time. This is especially important when visiting Ulema. One should always endeavour to seek an appointment where possible to avoiding inconveniencing someone. As people have their own schedules and it may not be convenient for them
Imam Nawawi (رحمة الله عليه) said:
"It is strongly recommened for Muslims to visit the pious people, their brethren, neighbours, friends and relatives, and to be generous, kind and obliging to them. However, the extent of the visit varies according to the hosts circumstances. The visit ought to be conducted in a pleasant manner and at convenient times. There are numerous sayings and traditions in this regard."
(Al Adhkar in the chapter of Isti'dhan)