It depends on how easy it is to find out where you now work and how motivated they are. Could be a few weeks, months or years. If they bring you back to court on a citation to discover assets then you will have to tell them the truth. Once they know it could be done within a couple of weeks to a month. Bankruptcy may be an option or a settlement. Call a debt collection defense attorney if you want to get this off your back once and for all.
Aggressive collection lawyers use multiple means to find your employer. How long? Not known.
If they have trouble finding the new employer they could use a Citation to Discover Assets making you appear in court and ask who you work for.
Consider Chapter 7 or Chapter 13, depending on your circumstances.
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