Day of the week segmented with 2 horizontal lines for each day with ability to extend right and/or left, all done through one dialogue panel.

Each day is segmented beginning at 630pm NY Time and each day is marked separated vertically.

Each day has it's own horizontal coloured segments that are only for that day and highlighted with an opaque colour scheme, each day's lines can be extended by 4H(current),
8H, 12H, 16H, 20H, 1D, 2D, 3D etc etc up to 20D assuming there's only 5 exact days in the trading week.
(if you can't choose lines or have no awareness of what graphically looks simple yet effective I can provide colours)

An indicator running along the bottom of the chart identifying what market hours it's currently operating in, colour coded with overlapping such as NYLON
clearly understood.
(This feature will have a show or hide function)

This is all controlled through one dialogue box with settings as follows;

A column of weeks of the year, (current week is visually indicated somehow)
A column of days for that week, (current day is visually indicated somehow)
A column of time settings as stated above (4H 8H etc etc),
A single drop down menu for the year,

When extending a horizontal line, if it is 4H it should go back a 4H segment as if the day is split into 6 4H segments, what I mean here is that it should fill an incomplete
segment accordingly;
say a segment is 3H 52M in it should go back to that amount and update each minute or 5M (whatever TF the chart is set on) until that segment is complete, the line will
stay extended to that point until a different setting is confirmed via the dialogue box.