Number + 个 + 星期
The noun 星期 (xīngqī) means 'week' and is one of the most common time words in Chinese. It is used with numbers to form days of the week (星期一 through 星期日) and with measure words like 个 when counting multiple weeks.
你星期几有空?我们出去吃饭吧。
Nǐ xīngqī jǐ yǒu kòng? Wǒmen chūqù chīfàn ba.
What day of the week are you free? Let's go out to eat.
这个星期我特别忙,下个星期再说吧。
Zhège xīngqī wǒ tèbié máng, xià gè xīngqī zài shuō ba.
I'm especially busy this week; let's talk about it next week.
他每个星期都去游泳两次。
Tā měi gè xīngqī dōu qù yóuyǒng liǎng cì.
He goes swimming twice every week.