I used to leave a hook at the end of the week and tell myself that suspense was part of the pleasure. It was not. Readers who missed a Sunday came back to a half-remembered corridor and a character whose name had slipped. I was writing as if attention were a renewable lease, and it is not.
A week is exactly long enough to build a complete arc if I protect Wednesday for the draft and refuse to start a tale I cannot finish in one sitting. The pressure is useful. It stops me from decorating a plot that has not yet earned its ending, and it gives the Sunday letter a clean edge: here is a story, it begins, it turns, it stops.
If you fall behind, you may join on any Sunday without being lost. There is no required order and no cast you must already know. Occasional loose sequences are flagged in the endnote well in advance, and even those can be read alone. I would rather you arrive mid-year and find a door that opens than a corridor that only makes sense from January.