Jamieson, Fausset and Brown on Job 14:14

14. shall he live?--The answer implied is, There is a hope that he shall, though not in the present order of life, as is shown by the words following. Job had denied (Job 14:10-12) that man shall live again in this present world. But hoping for a "set time," when God shall remember and raise him out of the hiding-place of the grave (Job 14:13), he declares himself willing to "wait all the days of his appointed time" of continuance in the grave, however long and hard that may be.

appointed time--literally, "warfare, hard service"; imlying the hardship of being shut out from the realms of life, light, and God for the time he shall be in the grave (Job 7:1).

change--my release, as a soldier at his post released from duty by the relieving guard (see on Job 10:17) [Umbreit and Gesenius], but elsewhere Gesenius explains it, "renovation," as of plants in spring (Job 14:7), but this does not accord so well with the metaphor in "appointed time" or "warfare."