sān tiān liǎng tóu
lit. twice every three days (idiom); practically every day
frequently
sān tiān bù dǎ , shàng fáng jiē wǎ
three days without a beating, and a child will scale the roof to rip the tiles (idiom)
spare the rod, spoil the child
sān tiān dǎ yú , liǎng tiān shài wǎng
lit. to fish for three days and sun-dry the nets for two days (proverb)
fig. not to persevere in doing sth
to do sth by fits and starts