The boiled water (100oC) is brought to the suitable temperature for that yeast to work as ten - 15oC. This temperature depends on the type of yeast and the kind of beer. When I went, I arrived suitable and noon lunchtime, plus the gates had been locked; So be sure https://lanejmnnl.blogmazing.com/28646224/the-2-minute-rule-for-sai-gon