I don't have an amount of time because it varies, but I do have problems getting out of bed if it's early. Trying to wake up without an alarm clock? Nope, not happening. Morning person, no. Always been a night owl.
And even with the alarm, if I feel like I can sneak in a few more moments' of sleep, I will. Usually it's not bad enough that I'll fall right back asleep and dream about getting up a few times before I actually do (has happened a few times to me), but...waking up is definitely not a fast process for me.