en_tn_condensed/mat/04/22.md

they immediately left

"at that moment they left"

left the boat ... and followed him

It should be clear that they immediately put their nets down and left that place with Jesus. If your language requires you to tell whether they were leaving for the rest of the day or for a long time or for the rest of their lives, you should probably translate as they were leaving for the rest of their lives. It would be good to have a note saying that the Greek does not specify how long they would be gone.