如果没有适当的快捷方式，则明确列出所需时间没有什么问题：

There's nothing wrong with explicitly listing the times you need if there's no appropriate shortcut:

# Tuesday + Wednesday 8pm - 10pm
*/5     20-22       *   *   2,3 $COMMAND

# Friday 8.30pm - 10.30pm
30,35,40,45,50,55   20  *  *  5  $COMMAND
*/5                 21  *  *  5  $COMMAND
0,5,10,15,20,25,30  22  *  *  5  $COMMAND

# Saturday 3.30pm - 5.30pm and 6.30pm - 8.30pm
30,35,40,45,50,55   15,18  *  *  6  $COMMAND
*/5                 16,19  *  *  6  $COMMAND
0,5,10,15,20,25,30  17,20  *  *  6  $COMMAND

# Sunday 3.30pm - 8.30pm
30,35,40,45,50,55   15     *  *  0  $COMMAND
*/5                 16-19  *  *  0  $COMMAND
0,5,10,15,20,25,30  20     *  *  0  $COMMAND