Bismihi Ta'aala

Wa-alaykum As-Salaam

(1) If during the time of the prescribed Salaah a person does not have enough time for one to make wudhu and perform the prescribed Salaah, then such a person will be classified as Ma'zur. However, if one has more than the above prescribed time, then in this case the Salaah will be invalid, and one will have to repeat the Salaah.

(2) To avoid the above mentioned case i.e. shaytan playing with one's mind, after cleansing yourself in such a manner that you are satisfied that no drops of urine are remaining, you should splash some water on your undergarments. Thereafter, it is ok to perform Salaah. If any drops still come out, then you are relieved of having to repeat wudhu or Salaah.

And Allaah knows best.