From Nema to Islamic definitions, to Landings. Sawa tu.

<Question 1> Yes, why not? Praying and landing are separate activities. Also there is a dua for landing. For details.

<Question 2> Yes, a bath is a must before pray if there was landing. I already told you this. Google ghusl for details.

Allah say:
"O you who believe! Approach not As-Salat (the prayer) when you are in a drunken state until you know (the meaning) of what you utter, nor when you are in a state of Janaba, (i.e. in a state of sexual impurity and have not yet taken a bath)... Truly, Allah is Ever Oft-Pardoning, Oft-Forgiving." (Quran 4:43)

@Impunity no, you don't have to shower between rounds. You didn't read my reply, did you? The requirement is clear from that verse I just posted (Quran 4:43). When you check my schedule, did you see any bath between 9:45pm and 5:00am? But no one will stop you from showering as many times as you want, it is up to you. The only commanded in Quran 4:43 is bath required before prayer, whether it is 15 mins away or 1hr away or 2 hrs away or 8hrs away from prayer time.

@impunity what is the question? Read through my "long" replies addressed to you and see if the answer is not there before you ask again.

Summary
1. Wash yourself after landing, kuondoa uchafu caused by landing (why should somebody explain to you as if you are a child? Or you want me to tell you where to wash?)

2. Before prayer, Muslim must take wudhu (washing hands, face, and feet) if there is no janaba (you can google this). Or take a bath before praying, if there was landing (why does it matter to you if landing took place 15 mins ago or 8 hrs ago? as long as you did no.1 above)

3. If you want to pray at night, which is optional, it is up to you. Refer to (2) above for conditions.

4. You can land whole night, but if you want, if you are allowed, it is up to you. Refer to (1) above.