a list as long as (your) arm

if you say a list is as long as your arm, you mean that it is very long.

Anyway, I'd better make a start. I've got a list as long as my arm of jobs to do.

• a race against the clock
• a race against time
• a race against time clock
• a rainy day fund
• a rake-off
• a rap across the knuckles
• a rap on the knuckles
• a rap over the knuckles
• a rap sheet
• a rat fink
• a rat race
• a raw deal
• a ray of sunshine
• are all over
• a red cent
• a red eye
• a red herring
• a red-letter day
• a reign of terror
• a Renaissance man
• a rent boy
• are someone all over
• are something all over
• a revolving door
• Are you a man or a mouse?