Two major positions concern when an unrestricted command must be fulfilled: fawr (immediacy) and tarākhī (permissible deferment).
In the Hanafi discussion, the principal treatment associated with Abū Ḥanīfa and his companions allows deferment; al-Karkhī is reported as holding that an unrestricted command requires immediacy. Other scholars also adopt the immediacy position.
The key question is whether the bare imperative supplies a time restriction when the law has not specified one. Advocates of deferment require separate evidence before adding such a restriction.
Hastening to perform a duty may be recommended; recommendation to hasten and obligatory immediacy from the wording are different legal propositions.