No Real Formula?

Is there really a formula for the time you should be over someone? If you were together for 1.5 years, how long would it take to get over that person? This is definitely by God's grace, but after getting out of a long relationship, I got over everything surprisingly quickly. I know I had lots of prayers and God was definitely working in my heart, but it just surprises me for being able to get over someone who meant so much to me in the past so quickly. Yes, I was grieving for 2 days and couldn't eat or concentrate on anything else... but now, I just feel so relieved. The cloudiness in my mind is definitely all gone. I've definitely learned a lot from my past relationship, and I'm definitely having a really easy time moving forward right now.