Please don't take what Pablo said as harsh. I know it's not what you want to hear, but he is 100% correct and is giving you the best advice that any big brother would give.
There is a reason your girlfriend is an "ex." It's because the relationship wasn't meeting her needs. If you take a HUGE step back, you will probably find it wasn't meeting your needs either. Sure, you screwed like rabbits, you got to hang out, she smelled nice, and she inflated your ego. That's not what you need to maintain a healthy relationship. How are your communication skills? What are your needs in a relationship and have you clearly defined them? Have you asked your latest chickie snack what her needs were and share yours? Do you know what a healthy relationship is? Do you know how to keep one going? When you fight with your girlfriend, can you fight fair, or do you eviscerate her?
Personally, when a woman becomes an "ex," my motto becomes, "On to the next victim." Depending on the level of emotional maturity and life skill advancement between you two, you might be inviting major problems back into your life. Sometimes is just better to burn the bridge and move on.
So, because you asked, four days isn't a whole lot of time for a NAP ritual. It can take up to 30 days. Might take longer than that. If she is what you REALLY want, I would suggest getting you lover back, then exciting love. The issues of why you broke up will still be there and you're going to have to work fast and hard to start fixing them.
Or, as a big brother, I say use this time to work on you. Go to your local library and read some of those embarassing books on relationships, communication, Dale Carnegies How To Win Friends And Influence People, etc. Sit down and make a list of all the qualities you want in a woman. Make a list of all the qualities that you will NOT put up with. Then make a list of your qualities. Are you the type of dude that your dream woman will be attracted to? I will start you off with basic hygiene. Women love basic hygiene. Keep going from there. Do the healing invocation. Ask to be healed of all your past relationship traumas. Then, invoke Dynamis and become a badass. Dynamis will help you hone your social and communication skills. After all this, do the chant to attract love. Take the top five qualities that you are looking for and can't live without (hint: large boobs, does anal, or swallows shouldn't be in there, unless it's an absolute deal breaker). Tell the spirits about your top five list and then get out of the house and go to places where you would meet your dream chick. Help the spirits help you.
That's the best advice I can give you. Either way, this is your chance to experiment. Make the best of it. Keep an open mind and your eyes open. Success leaves clues...
Of the Seven Deadly Sins, Lust is definitely the pick of the litter ~ Anon