Either because the people, being wearied out by the late civil war, were not forward to engage in another; or because the soldiers had more affection to Joab than to their new general, to whose ill conduct possibly they might impute their unsuccessfulness in the last battle; or because Amasa for his own interest might seek delays, to render himself more necessary and useful to the king, and to keep up his honourable and profitable employment, which is the common policy of such men.
Related Commentaries of 2 Samuel 20:5
2 Samuel 20:5
5 So Amasa went to assemble the men of Judah: but he tarried longer than the set time which he had appointed him.