Yeshayahu Hollander asked:
On Ketuvut 70b we learn that a Shaliah can be trusted to do his Shlihut for 30 days only.
This seems to contradict what we know: Hazakah Shaliah Oseh Shlihuto!
A possible reconciliation of our Gemara with the Hazakah Shaliah Oseh
Shlihuto :
It seems that this is a further proof that the Gemara means the particular kind of Shaliah described later on: a volunteer, who answers the call: "Kol HaZan Eino Mafsid"
Is there a better reconciliation?
The Kollel replies:
"Chazakah Shaliach Oseh Shelichuso" relates to a one time Shelichus, not to an ongoing one.
Dov Zupnick