Default 5s timeline when importing .ppt to storyline2

Hi,

I have a large (80+) slide training course that I'm converting to E-Learning. I have imported it but Storyline has defaulted all the slides to 5s and automatically moves to the next slide / element. This is too short for my purposes and I want the learning to click next (or on an interactive element) when they are ready to move on. 

From searching for my problem I can see that mass edit of timeline was a feature request a couple of years ago, was it implemented or is there a solution that doesn't involve me having to edit each slide individually?

Thanks

Stuart