A practical default is to have your email arrive around 7:30 to 9:00 a.m. in the recipient’s local time zone. Bankers often review messages before the workday becomes crowded with meetings, calls, and live deal requests. Your note may therefore receive more attention than it would during a busy afternoon.
Tuesday through Thursday mornings are generally sensible choices. Monday inboxes can be crowded after the weekend, while Friday schedules may be less predictable. These are guidelines rather than universal rules: workloads vary by banker, group, office, and deal cycle.