How long?

Now that I am taking my synthroid at night, I wonder how long it takes to actually have an empty stomach. I researched on the net and the consensus seems to be twohours. Although one would think that it depends actually on what you eat, a steak would take longer to leave the stomach than an apple. I am not able to sleep too long, about five hours and then I am up, so I am thinking the synthroid is working. I’ll see next week after my TSH levels are tested.