Ghusal

Q: I was not able to take out one or two strands of pubic hair during shaving. I still made my ghusal for haidh. Was my ghusal valid?

Q: While making ghusl, I forgot to wash the inner part of my navel with my finger. Is the ghusl valid or do I have to repeat the ghusl? Is rubbing inside the navel necessary in ghusl?

Q: Because of my excessive masturbation, I got pre-ejaculation. If I see a girl continuously for some seconds mani comes gushing with desire automatically without even touching my private part and without me wanting mani to ejaculate. Is this because of my sickness? Most probably this is a sickness because when I defecate with force, then without desire mani comes out.

My question is:

Many times I see a girl and feel desire in my penis and I feel something is going to come out gushingly so what I do is, without holding or touching my penis I pinch myself on my legs or I think about something else so that the desire goes away and then after sometime mani comes out without any desire and also this comes without wanting to do it. Must I do ghusl for this?

Q: I was about to have a wet dream, but suddenly I woke up and saw no mazi on my clothes and nothing on my private part. After I stretched, I saw a very tiny drop on my private part. Is ghusal compulsory upon me?

Q: Can a person gargle and make istinshaaq before sehri ends and thereafter make ghusal? 

Q: Can a person face his back towards the Qiblah while bathing?

Q: If I do istinja in my shower with the water from my shower, will the floor in my shower become najis? If it becomes najis, how can I purify it?

Q: Which direction should we face while taking bath?

Q: On average how many minutes should a:

1. Fard ghusal take?

2. Sunnat ghusal take?

And how should we get rid of doubts when taking a ghusal?

Q: When a woman who has plaits performs ghusl, is it compulsory for her to wash the entire length of her plaits or is it only compulsory for her to wash the very bottom of the hairs which are plaited.