public long getLeaseExpireTime() {
      return leaseExpireTime;
    }
Returns the lease expiration time. This the absolute time in milliseconds when the current
lease will expire.
<p>
Caller must synchronize on this grant token.

Concurrency: protected by synchronization of *this* DLockGrantToken

@return the lease expiration time
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/DLockGrantor.java