Thanks for your remarks, M Chin! Without reading the text myself it’s a bit difficult for me to give you precise recommendations. Having said that, I suggest trying to come up with different ways of informing the reader that the current chunk of the narrative is taking place on the same day. You don’t necessarily have to do this directly. For instance, you could briefly mention one or more of the following (or similar types of) occurrences:

• A change in weather (e.g., “John pulled his hood over his head as he shuddered from the cold and thought to himself, ‘Why didn’t I bring a jacket with me when I left the house this morning?’”);
• A change in the character’s physical state (e.g., “John’s stomach growled as he realized he couldn’t remember how many hours had passed since he had last eaten something”); or
• A hyped-up media event that has yet to take place (e.g., “John walked down the street as a television in a storefront shop informed him that the President still hadn’t met with reporters, despite having promised to do so more than four hours earlier”).

Hopefully you see what I’m driving at here, so to speak. Good luck!