I was watching ISC and X-treme fleet members use photonic Leech today and it was stacked 8 times and the countdown would start over after just a couple seconds. Meaning 100% uptime constantly.
Below are some screen caps taken only a few seconds apart. Sadly the lowest I saw the countdown timer go to was 13 then it went back to 15 seconds.
The best proof I can offer are these photos and the chat listed along with it as a time-line. For those who are savvy can view the date and time they were created as proof as well by viewing the file data.
Here is a link to an album with multiple photos taken closely together.
NOTE: The photos are NOT meant as an attack on these players. It was the only way I could capture what was going on to share on here. I hope Cryptic will fix this and the ability to see cloaked ships at the same time.