这几天我很忙.你在中国待多久?有空我再联系你.用英语怎么说?

这几天我很忙.
I'm quite busy these days.

你在中国待多久?
How long will you stay in China?

有空我再联系你
I'll contact when i'm available.

i am so busy these days.
how long are you staying in china?
i will contact you when i am not so busy~

I am busy these days.How long will you stay in China?I will contact you if I have time.

I AM QUITE BUSY THESE DAYS
HOW LONG WILL YOU BE STAY in China.
When I free,I will contact you soon.