Personally I never did audio cards (though I did a lot of listening and conversation outside of Anki) or reverse cards for Japanese. My vocab decks were J->E, and my Kanji decks were Kana->Kanji. I always practised writing my answers on the screen using the whiteboard feature.
I think you should strive to keep your decks under 15 minutes total. That means you can complete them in three 5-minute blocks a day. Any longer and I found I would A) miss a deck, meaning I had to catch up the next day; or B) try to rush through them.
I highly recommend trying to engage in conversation as much as possible. In my city (in Australia) I went to "conversation classes". Basically Japanese people wanting to improve their English would meet with Australians wanting to improve their Japanese. It went for an hour, half of which was spent talking in English, and half in Japanese. And if you can only speak a little bit of Japanese, it's totally fine, you can just speak in broken Japanese mixed with English. It was really fun! You'll find opportunities to use your new vocab, and it'll stick much better.
A lot of software make empty promises around productivity improvements. Especially in education. Anki is one of those rare tools that genuinely 10x's you over your peers. I used it when studying Japanese and it was a massive help.
However, having used it for over 12 years to memorise many different things I have noticed one caveat.
If you're not also using what you're memorising outside of Anki, I feel like your ability to recall gets trapped within the context of using Anki.
For example, if you're learning Japanese vocab through Anki, and also trying out your new words via conversation and reading/writing, you'll rapidly learn new vocab AND be able to recall it anywhere.
However if you're learning Japanese on your own and not really conversing/writing, no matter how good your recall with Anki is, you'll struggle to recall those same words anywhere else.
The cool thing about Anki is you can also use pictures/audio. So if you're learning music theory you could memorise chord shapes/intervals. Or human anatomy.
I have a few wired headphones I absolutely love. Sennheiser HD650, Sennheiser HD58x, Oppo PM3, to name a few. I'd like to use them wirelessly, because, hey, it's just super convenient...
I clip this small receiver onto the headphone band (above the ear), and run a small cable up along the side of the headphones. Now my headphones have bluetooth!
It powers up the Oppo PM3 and Sennheiser HD58x's more than enough, and it sounds great. It's comfortable and light - you wouldn't even notice honestly.
I think you should strive to keep your decks under 15 minutes total. That means you can complete them in three 5-minute blocks a day. Any longer and I found I would A) miss a deck, meaning I had to catch up the next day; or B) try to rush through them.
I highly recommend trying to engage in conversation as much as possible. In my city (in Australia) I went to "conversation classes". Basically Japanese people wanting to improve their English would meet with Australians wanting to improve their Japanese. It went for an hour, half of which was spent talking in English, and half in Japanese. And if you can only speak a little bit of Japanese, it's totally fine, you can just speak in broken Japanese mixed with English. It was really fun! You'll find opportunities to use your new vocab, and it'll stick much better.