Differences between 度 and 回 when counting occurrences


What are the differences between using 度 and 回 when used to count number of
occurrences?

For example:

  1. そんなことは一度もしたことがない

  2. そんなことは一回もしたことがない

Are there any restrictions on what kind of actions referred by そんなこと that can
be used with 度 or 回 in the examples above?




For counting a number of occurrences 回 and 度 are interchangeable with small
numbers. Somewhere around 4 (the line is quite vague), 度 becomes uncommon, and
by the time you get to 6, 回 is pretty much the only one used. (Naturally, 度
can be used with any number for counting degrees, as noted in Azeworai's
informative answer.)

