I had never heard that - we were told 3 months for my older daughter, but I guess the dose was different?
S really did say that it was the least painful shot by far (she has been on Humira, Enbrel, Simponi -- all shots!). If you're doing the shot and don't mind syringes, she said the syringe was even less painful than the pen.
D is getting a different dose - for M we discussed Simponi every 3 weeks instead of the regular 4 (after the loading dose of two 100mg shots).