There were three important parts to a guild contract.
First was the bond period. It was the time the superhuman was required to work for the guild after signing the contract.
Often, bond periods are set in years. But there were cases where it would be in decades.
That was an oddity, but you never know until you read it.
Superhumans are known to live longer than normal people. Some of the S rankers in their eighties still could perform like they were in their twenties.
So, a guild would only gain by setting the bond period as high as it can.
From some of the less trustworthy guilds' perspective, there was no loss in scamming a young chump to work for them for an eternity at a low wage.
Hence, it was correct to always be wary of guild contracts.
While that may be true, Nova Rift doesn't usually go that far. They had their reputation to maintain, thus their bonds often only spanned five to fifteen years.