The speed depends on the experience of the artist, technique, and most importantly the client's skin. You can believe it or not but each skin is individual. If you think I'm making this up, you can google and read about the types of skin. Healthy good skin allows working faster. Dry thin skin adds complexity and time to work. It is not good to work quickly in this case because otherwise the skin will turn into minced meat :)
If you have high blood pressure, drink blood thinners pills/ibuprofen/aspirin, or smoke weed before the session, then it will be longer and more difficult to tolerate because your skin bleeds a lot and expels pigment. It is recommended to eat properly at least a month before the session, to exclude any blood thinners pills a week before the session. Do not smoke weed or drink coffee before the session and then your tattoo session will be more comfortable than usual. Do not take pain relievers, they do not work, they only make it worse, worsening the quality of the blood, which affects the quality of the tattoo.

I don't do geometry, tribal, and lettering. I do color/black and gray. I am convinced that everyone should do the job they like. Every good tattoo artist works in the style that he (she) likes the most. It's best for you to choose an artist in your style. If a person takes on any job, it seems weird. Maybe this artist is an ordinary moneymaker and there is no art in this case since a tattoo is primarily an art on the skin.

It depends on many factors. The quality of the client's skin, the correct aftercare after the tattoo, the correct CARE of the tattoo during the life, and the correct technique of applying the pigment under the skin.
A client who does not follow the aftercare instructions is guaranteed to get a bad healed tattoo even if he (she) had the best tattoo artist in the world. The healing process of the tattoo is one of the most important parts and it is on it that the client very often does not pay attention. Why? Before me, you did small tattoos/lettering/black and gray shading, there was little trauma to the skin and the tattoo healed quickly, not requiring special care. I made you a tattoo and you decided that you don't have to look after it, and as a result, you need a touch up.
Very often clients like to say the phrase "before that I had a 9-hour tattoo session with one artist, it didn't hurt at all, I can sit out for 12 hours, no problem", but unfortunately "it didn't hurt" is not a guarantee a good tattoo. This is one of the reasons why there are so many faded colored works made by such artists.
Take aftercare instructions seriously https://dotty.tattoo/aftercare
If you are often in the sun, you need to apply an SPF lotion to the tattoo to protect it from the sun. For example, you are from Vegas or Florida, if you do not protect the tattoo from the sun, after a couple of years it will be nowhere to be seen. It will look like a stain and there is no fault of the artist. Just buy SPF lotion and use it always before going out in the sun. I use SPF Lotion always when I visit an outdoor pool or hike in the mountains, ALWAYS! Permanent dry skin requires constant moisturizing with a cream, don't forget about it.

The price depends on the skills of the artist, his (her) popularity, and demand in the market. The number of followers and likes does not mean anything.
The healed tattoo is of the greatest value. A tattoo artist may have a lot of good fresh work but healed work are very different from fresh work.
The difficulty lies precisely in a good healed tattoo but not fresh. This is why many artists do not post healed tattoos in their portfolios.
You can check my healed works on my Instagram page (highlights).
The style of the tattoo does not affect the price but the quality of this work, done in any of the styles, affects the price. It is necessary to choose an artist, not a studio.
The more elite the area and the more pompous the parlour, the more expensive the tattoo is, while the quality of the tattoo does not in any way affect the atmosphere in the parlour. Are you ready to overpay today for an expensive area and the pathos of the parlour - it's up to you. The most important thing is the disinfection and sanitary conditions in the parlour.
Pay attention to what the artist is doing, what his (her) hobbies are. The tattoo artist is constantly barhoping or developing his (her) skills, constantly drawing, studying, and taking art classes from other artists, i.e. the artist is interested in career growth and wants to make a better and better tattoo and does not use you as a wallet to pay for his (her) needs under the guise of "you are my buddy".
Due to the situation with COVID and the ban on walkin appointments, many tattoo artists and parlours in the United States have closed since they worked thanks to the flow of people but not quality. They do not have and did not have a client base, they did any job and did it badly, getting a logical result for their career.
A plastic surgeon's scalpel does not cost a lot of money but this does not mean that breast augmentation will consist of the cost of consumables :)
A tattoo is not just a tattoo machine and a needle, a tattoo is knowledge and skills. The more an artist has clients, the more good works he (she) has, the more he develops, the higher the price will be. I still study canvas oil from two artists and pay constantly for lessons with them. As well, I buy webinars from other tattoo artists, knowledge is never too much. All this costs money, this is important for good tattoos.

Cover up for a tattoo is always more expensive than a new tattoo, especially if you think that there is nothing to do there. Not every tattoo can be a cover up. It is also necessary to carefully choose a design for a cover up because the back layer can very often show up on a new tattoo and the cover up always needs a touch-up after the tattoo is healed. Leave a request on the site, attaching a photo from your tattoo for cover up and I will calculate the price.