Eihnlazer wrote: Unless they meant player turn, but this was written at the start of 8th before they clarified player turn and battle rounds.
Err, what?

8th edition used the Battle Round and Turn terminology from the start.
BRB 8th edition, Page 176 wrote:Warhammer 40,000 is played in a series of battle rounds. During each battle round, both players have a turn. The same player always takes the first turn in each battle round – the mission you are playing will tell you which player this is. Each turn consists of a series of phases, which must be resolved in order. The phases are as follows:
The stratagem states until the end of the turn, so it lasts until the end of the turn, not the end of the Battle Round. 9th edition uses near-identical wording
BRB 9th edition, Page 204 wrote:Warhammer 40,000 is played in a series of battle rounds. In each battle round, both players have a turn. The same player always takes the first turn in each battle round – the mission you are playing will tell you which player this is. Each turn consists of a series of phases, which must be resolved in the following order: