20 minutes a day: Is focusing purely on the script a waste of time at the start?

I'm extremely busy with work and only have a 20-minute window daily. I keep bouncing between Duolingo, Pimsleur, and trying to learn the Bengali alphabet, but I feel like I'm not making progress in any of them. If I want to be able to hold a basic conversation within a year, should I drop the script for now and focus entirely on phonetic speaking, or will that haunt me later?