Two 2.5-hour blocks, trigger-event list, paired scripts.
A disciplined SDR runs 100 to 120 dials in two blocks: 8am to 10:30am east-coast, 2pm to 4:30pm west-coast. The intervening hours cover research, follow-up emails, reply handling. On a trigger-event list with paired scripts and local-presence numbers, the day produces 2 to 4 meetings instead of the 0 to 1 that the untuned configuration generates.