How long from potential trigger to symptoms?

I’m new to all this . Was diagnosed with hitaitus hernia in January. On omeprazole 20mg twice a day. I can’t figure out why sometimes I’m fine and some days have awful reflux/ pressure in stomach. Example I had a Big Mac on Tuesday lunch ( which is unusual) woke up Wednesday with mild symptoms that got worse as the day went on. Is this a delay med response to big Mac? Would symptoms not have started sooner, like Tuesday afternoon/evening?