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I started immediately after PPL, wasn't far from completing and came to a complete stop (was near 100 hrs total and had most of the basic requirement completed except long XC). I stopped mainly due to work (I run my own business), but also because the rentals got really crappy and I had several in flight problems that cannot be detected on pre-flight. I had such a slew of failure in one month that I stopped completely and concentrated on buying my own plane instead of renting. Now that I own my own AC, I've flown 400 hours in it in a little over 4 years (just crossed 500 hrs), nearly all XC. I'll eventually get around to completing the IR, but in the area I live, there isn't a huge need for IR capability.