Two nights somewhere
On five days the boat moves every morning. On seven it does not have to, and the anchorage you liked gets a second night.

Itineraries
The full eastbound chain — Nusa, the Gilis, Lombok and the quieter southwest islands — with time at each anchorage instead of a schedule to keep.
Seven days is the first length where the boat stops moving every single morning.
The route
The front half follows the five-day route. What seven days buys is the back half — time, and the islands the shorter route has to skip.
Benoa, then south Bali and the gateway to the Nusa islands. Lembongan and Ceningan on day two — the mangrove channel and the snorkel sites.
Eastbound to the Gili Islands at first light, timed around the current. The one leg on this route that is a real passage.
The verdant interior and the Sasak coast, staged from the northwest anchorages.
The quieter southwest Gilis around Gili Gede, then the return west across the strait with a final night at Penida or Lembongan.
Days five to seven are the part the desk shapes around you, because by then the route has done its work and what is left is preference. Send what you want more of and it gets built in.
What the extra days buy
The five-day route reaches everything. What it does not have is any slack, and slack is most of what a week on a boat is for.
On five days the boat moves every morning. On seven it does not have to, and the anchorage you liked gets a second night.
Gili Gede and the quieter islands the five-night route usually has to leave out. Fewer boats, and the anchorages are emptier.
A week absorbs a bad morning. On a tight five-day plan a stand-down costs an island; on seven days it costs an afternoon.
Send the start date, the party size and what you want more of. Days five to seven are built around that answer.