At a high level, slackness issue says, it is not possible to guarantee that at any given point in time all honest miners see exactly the same blockchain length .
On the other hand, as we know the value returned by a function in a smart contract is the result of the blockchain consensus.
Assume, we define a function, time(), that returns the current time, i.e. "now", in a smart contract.
Question: How does the slackness issue affect the value returned by the function time()?