One version that has probably been suggested before is based on the chess clock. you have a limited amount of time to take a bunch of moves. -Say starting at the drop you have 66 hours ( average of 22 hours a move), to take three moves, in series, first moves 1, 2 and 3 within 66 hours, then moves 4, 5 6. within 66 hours , then 7, 8,9, within 66 hours, etc.. So long as most of your moves are done within 22 hours , the old 24 hour limit minus the two hour rule that allows a sitter to step in, you will have a fair bit of leeway most times to go over 24 hours to take other moves, if needed .
One time in three, the first move of a series, you have up to 66 hours to make your move, which is ample, and most times you should make your move within the old 24 hour limit, and prboably within the 22 hour average for this system. . . Say you take 21 hours, close to the old limit of 24 hours for a move but not in the danger zone of 22 hours, . You will have 45 hours to take your next two moves an average of 22 1/2 hours per move. You could go over 40 hours before making your second move,if an emergency arises, not recommended for slack play- likely to annoy other players and leave you struggling for time to make your third move .
Say after taking 21 hours for your first move in a series, you take your second move in the series within 15 hours. Now you will have 30 hours to take your third move. a fair bit more time than the old 24 hour limit. And once your third move is over the series starts again, you have 66 hours to take move 4.
Most times most Cc' 'ers will lake their moves within the 0ld 24 hour limit leaving leeway for emergencies.
And deadbeats should die quicker- if someone goes 66 hours without a move, that counts as three missed moves and they are out.