Conditions for the validity of Salaah

Q: If a person starts his Asr salaah just before sunset and the time of sunset enters whilst he is performing it, is the salaah accepted?

Q: I am currently excused (chronic excuse) with regards to wudu due to bleeding. I know that my wudu breaks when the next prayer time comes in. However once or twice I took too long to pray and when I checked the time, I was a few minutes into the next prayer time. Are those prayers invalid? Would they be invalid if I wasn't excused with regards to wudu?

Q: I want to know when can we offer Maghrib prayer if we miss it while traveling back to home from the office? Can we offer it with Esha prayer??

Q: I want to know qaza times for all 5 times salaah. What is the duration of time for qaza for each salaah?

Q: I want to know what should I do if I miss a prayer in traveling? For example, the Zuher prayer is offered from 1 t 2 PM but when I reach home its already 4 PM. So what should I do in such a situation? Should I perform the complete Zuher prayer at 4 PM or only offer the farz (obligatory prayer)? 

Q: What's the ruling on joining two salaahs as a musafir?

Q: What are the consequences if one prays Namaz with their clothes covering below the ankles ?

Q: If I am traveling from safar and I am on my way home, what is the latest time I can read magrib namaaz?

Q: If small baby urinates on my shirt or pants, will it be permissible for me to perform salaah with such clothing?

Q: How to offer prayer on a cruise (at sea) if the direction of the Qibla is unknown?