As long as the mom looks healthy, I put her back in the main tank 10 seconds after I strip the fry. If she looks like she got seriously picked at while she was holding (very ragged fins) or looks dangerously skinny, then I'll let her recoup for a few days. This has only been the case for me once.
*Note that the longer you keep the female out of the main tank, the more the other inhabitants will get used to her absence and they may give her a hard time when you put her back in. To minimize potential aggression, re-introduce her at night when the lights are out.