Reports the number of seconds, including partial seconds, that have elapsed since the start of the current 15-minute (900-second) SONET performance measurement period on this port. Admins use it to judge how far into the current interval the accompanying failure and APS counters have accumulated, so a low value means the counters reflect only a short window so far. Seeing eqSonetStatsTimeElapsed at 850 out of the possible 900 tells an admin the current interval's failure counts are nearly a complete 15-minute sample and can be reasonably trusted.