Think my friend is using it. He told me before it took him around 3mins or less to heat up but not sure can stay how long the heat as he always switch on the power whenever he go showers.
But since the brand is 707 should be ok. My friend has used it for around 2-3 years and so far so good ba. Btw I heard that joven brand is very popular in sg and can last normally at least 5 years
Maybe from JB got difference?