Try forcing the slave pistons back as far as they can go; with large common--point screwdriver. Could be they are froze.
Then, release banjo on master; pump, tighten. Do it a few times, Check fluid; Never let it get low.
Then, try rebleeding slave by book.
EDIT: If you have ABS, it might be holding you up. Get a Haynes book and see how to temporarily disable.
I have an old Honda, you Can Not bleed the clutch the way book says. Gotta use a 50CC syringe on the slave. Open bleed nipple, suck, close. Repeat. Hold syringe Above the slave so air can rise to top. May have to dump it if it gets full. Again; Never, let reservoir get low.
If you let res. get low, so the holes are uncovered, you have to do it All over again. You can't just refill the res.and keep trying. This allows air back in. This might be why it takes you so long.
Last time I bled clutch ( needs be done every 6 month-1 year), I needed New fluid, Period,. I tried industrial hydraulic fluid, as it wasn't a brake.