even. Even Bengel held that this refers to "the last judgment". And it is clearly the time of reckoning and of the reward spoken of in Matthew 19:29, when all will be justly rewarded.
Related Commentaries of Matthew 20:8
Matthew 20:8
8 So when even was come, the lord of the vineyard saith unto his steward, Call the labourers, and give them their hire, beginning from the last unto the first.