Will it help if Astro have slow Effect add to Gravity?

[cactuarzzzz]

Slow has diminishing returns like all CC effects. Go tank a Trust with Urianger as your healer. He applies a 15 sec slow with his gravity spell, which if you follow up with Arms Length you then get a 8 sec slow instead of a 15 sec one.

Will the duration go down below 8 secs if slow have been appiled a third time? Will a total of 27 secs enough for the big pull?