Who knows three hundred fifty?
חמישים ושלוש מאות - מי יודע?
The traditional Passover song "Echad - mi yodeya" implies a possible presupposition that there is a Jewish significance to be found for each natural number. Accordingly, there is an ongoing series on Mi Yodeya that is attempting to unearth significant Judaism facts about each number, in sequence.
What significant Judaism facts are there about the number 350? The more significant within Judaism and the more intrinsically dependent on the value 350, the stronger the answer. Please include sources for your information wherever possible, as with all other answers on this site.
Skip lazy gematria answers; give us something to sink our teeth into.