Personally, I would HATE to be at an all-day wedding. It’s tiring and starts to feel like an imposition on the guests.
Tightening up the time frame so there is minimal delay between the ceremony and the reception makes the most sense. The only way I would split up the two, is if the ceremony was for the closest friends and family (50-60 people, tops!) who don’t mind committing their entire day to the wedding.
Since my preference as a guest would be a 3pm (or later ceremony invite), assuming its a summer wedding I’d keep the snack items light - pakoras and samosa, maybe a gol guppa station, aloo tikkis. If you’re doing non-veg items, maybe mini seekh or fish kebabs or tikka botis and fruit platters or fruit based snacks. Have waiters circulate with the food and lots of cool drinks (fruit juices and mocktails). Maybe even have small gelato or icecream type desserts to help keep everyone cool.
If you want an early wedding time - can you not skip the appetizers and then go straight to dinner? If you need to serve dinner later then keep change up the specific cocktails/appetizers and the presentation and have an abbreviated cocktail hour.