In the update 22 notes, Race Against Time is addressed as part of the changes to Accelerate:

"Psijic Order

Accelerate: Increased the duration of the Major Expedition buff from this ability and its morphs to 4 seconds from 3. Note Channeled Acceleration will now last 12 seconds, rather than 9.
Race Against Time (morph): This morph no longer reduces the cost of sprinting by 50% for 4 seconds. Instead, it now grants immunity to Snares and Immobilizations for 4 seconds."

Here it indicates that the snare/immobilize immunity is 4 seconds, but a few lines later it's addressed again:

"Race Against Time:

This ability no longer becomes cheaper as it ranks up.
Reduced the Snare and Immobilization immunity to 1 second from 4 seconds.
The immunity’s duration now increases as the ability ranks up, up to a maximum of 2 seconds."

And here it indicates a maximum of 2 seconds. Which is it?