I visited Ahmadabad twice. First was just to go to the wild ass sanctuary and I spent a quick hour in the city to "tick" this off, not even knowing where exactly the core zone was. You can see the old style building fronts all over town center so it wasn't much different. On my second trip in the area I wanted to tick this off better and did the entire core zone walk, which actually takes less than an hour.

There also many packages for this Heritage Walk. Those are not more than 2h and if it involves guiding that's not a lot of time. I think it was maybe a mile of walking overall. I took a auto-rickshaw to Jama Masjid aka Jama Mosque which also meant sitting around for a while. It's a relaxing place, quite pretty, even the caretaker let me take pictures inside even if it wasn't allowed. I would say this is nice but not exactly the part Ahmadabad would be inscribed for. From here you can leisurely walk along the hike. It has a few signs and is generally easy to follow. Not everything here is worth checking out. I would have a quick look at the Fernandes Bridge (inscribed as Fernandez as if there was a latino person in the area in the 19 hundreds), then Dalpatram Chowk and eventually the Swaminarayan Temple which is definitely the highlight of the tour. When I was there it was a bit under renovations but while I wasn't that impressed with the temple itself I liked the old buildings surrounding it more anyway.

In the end I wasn't impressed enough to recommend it but Ahmadabad is a hub and going here is quite common. It wasn't even too far from the airport area that you can fit this into a stopover. You could even just visit Swaminarayan Temple for the best part and save some time. I was even happy with my previous "visit" but the second did totally complete seeing everything so I'm not stepping in this town again.