I'm reading over some benefits documents
Vesting
Your contributions to the account are vested immediately. You are fully vested in company contributions after two years. If you were a contractor at XXXXX before you were hired as an XXXXX employee, your time as a contractor may count toward your stock retirement plan (401(k)) vesting.
I just want to get a sense of how this is typically interpreted,
Say I started work as a permanent employee on 1/1/2015 and accrued company contributions until exactly two years later 1/1/2017 say for a total of $20K. Is this vestment on that portion of $20K that has been in the account for 2 years, making that $20K proportionally vest over the next 2 years or is the full $20K to be vested at once. In other words are the employer contributions itemized by contribution date or is it a lump sum thing?