The amount of time that has elapsed isn’t the deciding factor, it’s how much practice you fit into that time. If you only practiced for 1 hour a month then in 2 months time you could not even have learned to double-or-nothing properly. For someone with a full time job and family, 2 months worth of practice might mean Matrix and Kwijibo, whereas if you stuck someone in solitary confinement with nothing but a yoyo for 2 months, they’d probably know Jensen Kimmit Sandwich and Soiled Panties. 
So in other words, there is no “you should be this good in this amount of time” measuring stick. It’s all down to the individual and how much they practice. 