Hey CT- you are lucky then. The foul taste comes about 30+ minutes after taking it and persists for as long as you are taking the pills (5 days), ending only once you stop taking the medication, a few hours later. My let theory is that the medicine expresses into your saliva- I found the taste was worse if I was salivating and after I ate.
I actually stopped partway through because it was so bad. It tasted like something had died in my mouth, for days.