How do you distinguish between long and short vowels when listening to Sokoto vs. Kano Hausa?

I’m an intermediate learner and I feel like I'm hitting a wall. Even when I can read the text, my ears struggle to pick up the vowel length differences in casual conversation, especially when listening to speakers from Sokoto versus Kano. Does anyone have specific exercises to help train my ears to hear these subtle duration changes before I lose the meaning entirely?