[Veggie Todd]

Well, if we’re supposed to buy low and sell high, when do we start buying?

[Berlin_Freeper]

"This is just the beginning of the fall for the Russian economy,"

[sagar]

“Well, if we’re supposed to buy low and sell high, when do we start buying?”

When Russia hits the zero.

[Krosan]

Here is a chart with track record of Ruble vs Dollar since 1897 (during the Soviet period the rate was not convertible). That is trillion times drop in value. The answer to your question could be that there is almost never a good time to own rubles.