Is a wet dream after repenting from masturbation considered a breach of that repentance, what are the best times for repentance, and is Umrah a condition for repentance?

Repentance is immediately obligatory for all sins, and it is a lifelong duty. The conditions for the validity of repentance are: abstaining from the sin, resolving not to return to it, and regretting having committed it. Umrah is not a condition for the validity of repentance, and a wet dream is not a sin that invalidates repentance from masturbation.