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So around 4000-4500 miles.
If you really need help with the engine then you have a bunch of guys here to help, and many of the processes/steps can be borrowed from the Honda CG125 manual.
Taking lots of pictures really helps, and keeping your hardware separate and organized for each part helps prevent losing key parts.
I can tear down and re-assemble one of these little motors in less than a day, but I am a former bike and automotive mechanic, and I still work on machines, so it's familiar territory for me. Even for somebody like you it is possible to at least take it apart in a day or two. The more meticulous you are in disassembly the much smoother re-assembly will be, so take your time with the pictures and organizing like suggested before.
Your other option would be to pick up a new engine. Definitely going to be more expensive, and then I wouldn't blame you for questioning if it was worth it or not. You have two bolt in options here, get another CG250 - aka 167FMM just like the bike came with, or get your hands on a CB250 - 169FMM engine. The 169FMM is the OHC version of the engine, and would be a little boost in power - 2.5hp ish.
The 167fmm enine can usually be had for around 500-600 bucks while the 169fmm usually ends up around 700.
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