Hi Sassy!
Ive gone 5 months before but that was a little much!(my hair started to loc....lol). Now I think I can go 3 months fairly easily. Im at week 7 right now and planned to go to 12 but will relax at week 10 bc Im visiting family and want to look nice.
Basically like the ladies above said, handle your hair as little as possible. COMB it as little as possible too. Moisturize and deep condition like crazy. Coconut oil is great for new growth...As is co-washing. I notice my hair doesnt break when I do the co washes now(I used to get a lot of wet breakage)...the key is to detangle in the shower, then apply leave in and let it dry a little before trying to do anything to it. Once u get used to not having that fresh relaxer look all the time, its really not that bad....
The best styles are buns and braidouts for me.