Does calling to Allah have specific days or a specific time?

The questioner:
Did the Companions go out in groups, designating three days, forty days, or two months, leaving their families and wives? The call to Allah

The Shaykh:
The call to Allah is not limited to specific days or months; one calls whenever he wishes.

The questioner:
There is no fixed time for it.

The Shaykh:
If the group agrees to go out for a month or two, there is no harm in calling to Allah. Whether it is for a year or two, or whatever the duration, there is no fixed limit.

The questioner:
But usually,

The Shaykh:
there is a limit, because the Messenger (peace and blessings be upon him) sent seventy callers to the desert, and he did not set a duration for them. He also sent Mu'adh to Yemen, and he did not set a duration for them.

The questioner:
But their problem is what they are calling to.

The Shaykh:
There is no fixed limit for calling to Allah; it is according to what the callers see. If they set ten days, a week, a month, or less, or more, or if they do not set anything, it is according to what is easy. There is no fixed group for this encouragement; it is a convention for them so that they can prepare. Any duration of a month or two requires them to prepare so that they can depart with what suits them and is sufficient for them. However, if they are ignorant of how to provision themselves, they must set a duration so that they can depart with the provisions that are sufficient for them.