He wakes up a quarter of an hour before sunrise and delays purifying himself because of waswaas; can he do tayammum?
Question

                If someone with OCD or waswasah wakes up 15mins before sunrise can he perform tayamum if wudoo usually takes him 30 mins and ghusl takes him 2hrs and forming his intention for prayer takes about 5 mins?

Also, I have read on this website that one doesn't have to check for urine, after going to the toilet, due to doubt unless he be 100% certain. Therefore, how about checking for madhiy several times a day, since this is released whilst one is unaware and cannot feel it.
Praise be to Allah.
      Firstly: 

    We ask Allah to heal this brother and grant him well being, 
    because waswasah is a disease and a problem. 

    Secondly: 

    If a person wakes up and there is only a quarter of an hour 
    left until sunrise, this is sufficient time for him to do wudoo’– and even 
    ghusl – and pray, so it is not permissible for him to do tayammum. 

    Similarly, if he wakes up in a state of janaabah and the time 
    is even less than that, he should do ghusl even if the time for the prayer 
    ends. See the answer to question no.
    94311. 

    This person who is affected by waswasah should fear Allah and 
    realise that delaying the prayer until the time for it is over is one of the 
    gravest of major sins; the same is true of praying without being in a state 
    of purification when one is able to do it. So let him hasten to purify 
    himself and pray, and let him convince himself that this is the shar‘i 
    ruling that is binding in his case. Perhaps this will distract him from the 
    waswasah. 

    And Allah knows best.