AssalamualaikumIf a person wakes up about 15 minutes before sunrise but in a state of janaabah and when he completes ghusl the time for fajr had elapsed. It takes nearly 10 minutes for him to do ghusl maybe because of waswaas etc.Does he come under the heading of delibrately missing prayer and kufr?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger. {C}

If the person who is in a state of sexual defilement (Junub) wakes up shortly before the sun rises, then he should start by performing Ghusl (ritual bath), even if the sun rises while he is performing it. This is the view of most scholars.

Ibn Qudaamah said:

"If water is available, but the time of the prayer will expire if one becomes engaged in collecting it and using it, then, according to the view of most scholars, he is not permitted to perform Tayammum (dry ablution), whether he is a resident or traveling. This is because he is able to get and use water, so he is not permitted to perform Tayammum. This is also the case if he does not fear that the time of the prayer will expire. And since purity is a condition, then it is not permissible to leave it out of fear that the time of the prayer will expire, just like in the case of all other conditions." [End of quote]

This person who suffers from obsessive–compulsive disorder is not sinful, and he is not considered to be neglecting the prayer if he is delayed in performing Ghusl, because of this disorder, until the time of the prayer has elapsed; this is because the person who suffers from obsessive–compulsive disorder is overcome (has no control over himself), and he does his actions unwillingly.

Shaykh Ibn 'Uthaymeen said in Fataawa Noor ‘ala Ad-Darb, when speaking about the divorce uttered by a person who suffers from obsessive–compulsive disorder:

"Because this word (i.e. divorce) that is said by the tongue from the person who suffers from obsessive–compulsive disorder is said from him unintentionally and without will; rather, he is coerced and compelled by the power of this disorder and lack of impediment. The Prophet said: 'There is no divorce at the time of coercion.' Hence divorce is not effective from him unless he wills it with a real will and when he is tranquil.”

Allah knows best.