We keep זמן רבינו תם only, today Wednesday 01/28/15 was the שקיעה at 5:09.06 I made the הפסק טהרה not later than 5:25.36 is it still good?
Answer:
If you are from a community that keeps Rabbeinu Tam not only as a stringency, but even as the principle halachah (which can sometimes be for leniency), this will be okay.
Best wishes.
Sources:
For those who follow the times of Rabbeinu Tam as a “certainty” it follows that even after shkiya it remains day.
However, if one follows Rabbeinu Tam as a stringency, then the time is a safek (and according to some opinions it might be certain night, depending on where you are), and there will be a safek sefeika involved.
Some write that one can rely on the safek safeka, whereas other authorities are stringent on this matter.
See Iggros Moshe, Orach Chaim 4:62; Be’er Moshe 2:61; Beis Avi 3:117:3; Olas Yitzchak 117:3; see also Taz 110:15 and Shach 110:29-30.
Some authorities are stringent on this issue; see Kol Eliyahu, Yoreh De’ah 17.
If you keep Rabbeinu Tam alone, as noted in the question, you can be lenient.
