Albert Barnes Commentary John 6:21

"They were willing therefore to receive him into the boat: and straightway the boat was at the land whither they were going." — John 6:21 (ASV)

Immediately. Quickly. Before a long time. How far they were from the land we do not know, but there is no evidence that there was a miracle in the case. The word translated immediately does not necessarily imply that there was no interval of time, but that there was not a long interval. Thus in Matthew 13:5, in the parable of the sower, and forthwith they sprung up (the same word in Greek), Mark 4:17; Matthew 24:29; 3 John 1:14.