Ghusl

Bismihi ta'ala

There are two ways of performing a ghusl:

Tarteebi (sequential): This method means you must wash in a certain order, or else it will be invalid. The sequence is washing your head and neck, then your right side, then your left side, overlapping each side to make sure that particular section was washed completely. 

Please watch this tutorial for better understanding:

https://www.youtube.com/watch?v=JtDGChWoSeE&ab_channel=SheikhZaidAlsalami

Irtimasi (immersive): This is when you submerge your whole body underwater, and then make your intention for the ghusl you are performing. In this case, as you have immersed your complete body underwater, you do not need to observe any sequence of washing parts of your body, like the above ghusl.

Also, you must refer to your Marja' taqleed for these details, and what their specific fatwas may be.

And Allah knows best. 

Bismihi ta'ala

There would not be any shar'i time limit to perform a ghusl, unless it is an obligatory ghusl and you have a short time-frame for you to complete your ghusl and perform your wajib prayer on time and before its time finsishes. 

For example, you have not prayed Salat Fajr, and you must do ghusl janabah, and in 15 minutes it will be sun rise. In this case, you must do your ghusl as quick as possible, and have enough time to pray Salat Fajr within the required time.

In other cases, although you do not need to finish showering quickly, it's always important to be considerate of wasting water, as excessive use of water could also become haram. Be reasonable in how long it takes you to shower/do ghusl, and the less water you use the better. This is the Sunnah of Islam as well. 

And Allah knows best. 

Bismihi ta'ala

Yes, you can perform wudhu' right after your ghusl, but for wudhu' it is a necessary condition that your head and your feet be dry when you want to wipe them. 

Once you finish your ghusl, dry yourself down, and then do wudhu'. Another option is do your wudhu' before you do the ghusl.

And Allah knows best. 

Bismihi ta'ala

If one was to convert Islam there is no obligatory ghusl for them to perform. The only mandatory act is to recite the Shahadatayn.  

And Allah knows best.

Bismihi ta'ala

The necessary part to wash in the ear in a Ghusl is simply the parts exposed and accessible, and nothing more. Just allowing water to run down it would be enough and valid.

And Allah knows best. 

Bismihi ta'ala

When you do a ghusl, you must make sure that there is nothing that would prevent water from getting to your skin.

Unless of course water would harm a particular area and you must keep it dry. In this case, you perform Ghusl Jabirah. 

However, if you can get it wet, and you are able to remove the bandage, even though it could be inconvenient or hurt a bit when taking it off, then try to bear it, do the ghusl, and then use a disinfectant and put a new bandage on. 

And Allah knows best.