There was one founder event and geneticists estimate that it took place 800-600 years ago.
I think that this estimate is too late and that the founder event took place in the Rhineland.
Iwo Pogonowski wrote:
http://www.pogonowski.com/books/Jews...Poland_all.pdf
"(...)
Between 1340 and 1772, the Jewish population of Poland grew 75-fold, from about 10,000 to over 750,000. During the same period, the Christian population grew only 5-fold. This exceptional increase took place in large part between the 11th and 16th centuries, as a result of a massive movement of Jews from western Europe to greater freedom in Poland. Beginning in the 17th century, a steady trickle of Jews migrated west from the historic Polish lands, prompted by the Cossack uprising led by Khmelnitskiy in 1648. The Ukrainian Cossacks perpetrated the bloodiest massacres of Jews since the Romans. However, the tiny Jewish communities subsequently established in the west were much too small to generate a modern ethnic and political identity comparable to that of their parent community in Poland, which had the largest concentration of Jews in the world at that time. In the 17th century, the Polish Jewish population began to explode. Widespread Jewish teenage marriages resulted in unprecedented birthrates, considerably higher than amongst the rest of the population. Between 1650 and 1770 the number of Jews in Poland increased by over 300 percent to more than 750,000. (...) The Jewish population continued to grow throughout the Partitions of Poland (1795-1918), even though Jewish communal bodies lost the broad autonomy which they had previously enjoyed. (...)"
Population of Jews in the Holy Roman Empire and in the PLC over time:
http://www1.idc.ac.il/Faculty/Eckste...03sept2018.pdf
Pogroms of Jews in the Rhineland started during the First Crusade (year 1095):
https://en.wikipedia.org/wiki/Rhineland_massacres
"The Rhineland massacres, also known as the persecutions of 1096 or Gzerot Tatnó[1] (Hebrew: גזרות תתנ"ו Hebrew for "Edicts of 4856"), were a series of mass murders of Jews perpetrated by mobs of German Christians of the People's Crusade in the year 1096."
That is more than 600-800 years ago which is genetic estimate of the bottleneck.
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