Couple people have said it but it’s pretty individual I think. Do some testing and see what works for you.
For me, If it’s high intensity, I do those later in the afternoon say 5:30 or so and I’ll take a late lunch, something pretty high carb. around 1:30. If it’s a long, less intense ride, I’ll usually eat about 30 minutes before and still feel great. Really more specifically it’s the heat of the room I’m in that can cause more stomach distress. If it gets too hot, I’m way more likely to get stomach distress regardless of what I ate or how long it’s been.