After ten minutes he added one snake fang, that being the sixth sense. During the ten minutes he finished cleaning up most of his workstation so that all he'd have left to do would be cleaning the cauldron once it was over.

As soon as he'd added the snake fang, following instructions, he put out the fire and then added the other snake fang, then carefully stirred anti-clockwise once, then he watched as it went yellow and thick. West listened to the professor as he watched its progress.

.... they had to drink someone else's potion? That sucked. West didn't particularly want to drink it at all but he definitely preferred trialing his own, otherwise what was the point of taking so much care with it? Annoying.

He put his hand up. "Why can't we drink our own, professor? I'd much rather do that given I trust how I brewed it and someone else might've done something wrong and turned it into poison."

It was a good point, right? Meanwhile though, he did take a cup out and then add ice to conserve the remainder.