Hi question again
Clairvoyance and clairaudience - Ppl who want to develop these two practice ajna chakra meditation and throat chakra meditation right?
how long do they take?
How are these clairs used? like what exactly is the benefit of being clairaudient and clairvoyant? Are they controlled abilities or sporadic?
Do entities help develop them? If yes who ?
Clairvoyant is good but what could be the cons of these abilities? My occult tutor is busy so thought of asking others here 
Not ideally, no. You should clear the blocks and develop your internal energy evenly and in a balanced way to avoid causing yourself health issues. This is why in qiging energy is build in the lower Dan Tian first, and in Kundalini Yoga you start from the lowest base chakra and raise your energy from there on up. The psychic skills come as a natural consequence, not the object of the work. Many people try anyway, and deal worth the headaches and imbalance as a price to pay for “accelerating” thier growth, but it’s not real development and doesn’t last.
As long as it takes for you. It’s not a switch, it’s the development of a skill. You don’t walk into a gym and go "how long doe sit take to bench 500lb - neither do you put a time limit on developing your energy. Doing twice as much can make you take twice as long or even ruin you if you injure yourself, in the gym or with energy working.
Some try thier whole lives and never reach thier goals, most start getting new impressions from the subconscious in a month or so of daily practice. Impatience will kill it, you have to let all that relax and focus on the now.
Communication with your subconscious, and entities. So you can have conversations with entities in evocation, tell what’s an impostor and what’s real, and gain discernment for right action at right time. Or you can use it to help people who have not developed thier skills. .
Some and some. You have to learn to listen, you are already psychic and your subconscious communication with you is largely ignored. Follow your intuition.
You can ask. Use the search, some people on here have said who helped them.
In the shorter term, noise, over-sensitivity, empathic upset that isn’t about you that you have to learn to dial down. You can learn things you wish you didn’t know. As you continue to get stronger you can learn to lock out what you don’t want to sense.
Thanks a lot Mulberry
I know it’s been 14 days since your question, but I’d like to suggest this guide that helped me as well after years of “shutting down”. I’d suggest to use binaural beats alongside.
As for entities I was helped by Bael the first time I evoked him but it can be different for everyone, people have reported good results with literally every other entity out there.