When turning left onto a two-way street, it is important to ensure that you have a sufficient gap to oncoming vehicles approaching from your left to safely complete the turn without causing a collision. Based on general driving recommendations and safety guidelines, a gap of 6 seconds is recommended.
This allows enough time for you to make the turn safely, taking into account factors such as the speed of oncoming traffic, reaction time, and the distance required for the turn. Therefore, the recommended gap is:
6 seconds.