Exegesis:

For the same combination of the three verbs erchesthai … heuriskein … katheudein ‘come … find … sleep’ cf. 13.36 and 14.40.

ouch ischusas…; ‘were you not able…?’ ‘could you not…?’: either (as Revised Standard Version) ‘be able’ (as in 9.18), or, literally ‘have the strength’ (as in 5.4), which Taylor prefers.

ischuō (cf. 2.17) ‘be strong,’ ‘be able.’

mian hōran ‘one hour’: here a period of time. Perhaps the sense is ‘even (as little as) one hour?’

grēgorēsai (cf. 13.34) ‘to watch,’ ‘to stay alert,’ ‘to keep awake.’

Translation:

Since the perspective of the previous section has been the activity of Jesus, it may be necessary to translate came as ‘went back.’

Said may require rendering by ‘asked.’

For watch see verse 34.

Where there is no equivalent for hour in the strict sense of a precise period of time, one can often translate as ‘for even a short period of time’ or ‘for even a while.’

Quoted with permission from Bratcher, Robert G. and Nida, Eugene A. A Handbook on the Gospel of Mark. (UBS Handbook Series). New York: UBS, 1961. For this and other handbooks for translators see here .