The description for the Streltsy Double Time ability says that it “speeds up their Static Deployment time by +50%”, but what I’ve found is that it just gives them a straight 100% uptime on Static Deployment 3. When activated, it will automatically give them Static Deployment 3 and will remain on them (even when they move), until Double Time wears off.
If it was working as the tooltip implies, then they should be reaching a new level of Static Deployment every 2.5 seconds and it should deactivate when they move, but this is not the case.
To recreate, just research Double Time, activate Double Time while moving the Streltsy around.