Well theres still 2 more seasons
So in the grand scheme of things, Piper went in around fall, as the first season ended with that Christmas pageant, S2 went until about March/April as V was wearing a coat when she was run over and it seemed a little damp, S3 ended maybe in June/July with them enjoying a day at the lake, S4 ended August/ Sept and this season ended 3-4 days after that. So 5 years and not even a whole year of her being in there.
Unless my math is off and people have a better guess. There was definitely a season with valentines days and some little valentines party, either S2 or S3 and im thinking S2.
So another 3ish months for season 6 (if they go back to normal) and another 3-4ish months for S7 and we have Piper coming out and the story ends with the most boring characters storyline coming to an end