u/Embarrassed-Let-3430

I have 400,000 lines I need to start at line 1 and label it Account1, line 2 would be Account2. Dragging takes 20 min. Any way to speed it up?

So let's say i have a meeting at 9am, 11am, 3pm and 4:30pm. Every morning all those people that have scheduled with me, get a 8am text that says "we look forward to seeing you at your scheduled time of XYZ". Right now, I have the option of "1 Day Before" which I believe is 24 hours before meeting, and then "1 Hour Before", but there's no morning of, where everyone get's a reminder text before they start their day they have a meeting with us.