The Lord is not slow to fulfill his promise as some count slowness, but is patient toward you, not wishing that any should perish, but that all should reach repentance (2 Peter 3:9).
God is definitely patient with us all, but there comes a day (perhaps today) when his divine patience will end for you. Upon your death (perhaps today), you will face his righteous judgment. If you have not had your sins forgiven in this life by repenting and putting your faith in Jesus Christ (do it today!), you will be without hope. There are no second chances. Perhaps today is your last chance.