Two days is not enough time to see Mumbai. It is enough time to stop seeing it the way every first-timer itinerary tells you to. This plan skips the recap of Gateway of India as a photo stop and the sunset-at-Marine-Drive checklist item, on the assumption you already know both exist, and spends both days one layer deeper: the Fort and Kala Ghoda read as the actual Victorian Gothic and Art Deco architecture they are, the Elephanta ferry run with the logistics properly worked out, and a real neighborhood instead of a second helping of the tourist circuit.

Three days in Mumbai is enough to run the beyond-basics circuit twice over: two days getting the Fort’s actual UNESCO architecture and the Elephanta ferry right, then a third day most itineraries skip outright, Malabar Hill, the Dhobi Ghat, Mahalaxmi and Bandra’s back streets past where the postcard version stops. This plan assumes you already know the Gateway of India exists and don’t need another paragraph describing it. Mumbai was called Bombay until the Government of India’s rename took effect in November 1995, and a city three decades into adjusting to its own new name rewards more than a surface pass.

Four days is enough to cover the Fort’s actual architecture, run the Elephanta ferry properly, sit with a quieter neighborhood day, and still push out to the layers most visitors never bother with. This plan does not spend a page re-describing Gateway of India or Marine Drive as sights; it assumes you know both exist and gets on with the parts that take planning: the visa, the monsoon, and a Day 4 built around the Kanheri Caves and a Dharavi tour.

Five days is enough to run the full beyond-basics circuit and still add a day most itineraries never attempt: an actual food day. This plan skips the recap of Gateway of India and Marine Drive as sights, on the assumption you already know both exist, and spends the first four days on the Fort’s real UNESCO architecture, the Elephanta ferry done properly, a quieter neighborhood day, and the outer-suburb layer of the Kanheri Caves and Dharavi that a shorter trip has no room for.

Six days in Mumbai is enough to stop treating the city as a checklist. This plan does not spend a page re-describing Gateway of India, Marine Drive or the CSMVS museum, on the assumption you already know they exist; it moves past them into the Fort’s real UNESCO architecture, the Elephanta ferry run properly, a quieter deeper-texture day, the Kanheri Caves and Dharavi, a genuine food-and-community day, and a Day 6 trip out of the city with the transport actually sorted.

Seven days is the point where a Mumbai trip stops being a checklist and starts being a plan you have to actually manage: visa lead time, the June-through-September monsoon window, and two full days out of the city on top of five inside it. This plan skips re-describing Gateway of India, Marine Drive and CSMT as sights, on the assumption you already know they exist, and spends the week instead on the Fort’s real UNESCO architecture, the Elephanta ferry run properly, a quieter deeper-texture day, the Kanheri Caves and Dharavi, a genuine food-and-community day, and two day trips with the transport actually sorted.

Most Mumbai guides open with the Gateway of India. That’s backwards: the thing that actually decides whether you see it is the e-Visa application, and it needs sorting weeks before you touch a single sight. Get the visa right, dodge the June-September monsoon, and learn the three pieces of transport infrastructure that opened in the past two years, the Atal Setu sea bridge, the new Navi Mumbai airport and Metro Aqua Line 3, and the trip runs itself.