请问用英语说“如有问题，请在第一时间联系我”怎么说？

Question

尤其是你想强调的“第一时间”怎么表达

Answer 1

If any questions, please do not hesistate to contact me.
很难用直译的方法讲第一时间，建议用”不要犹豫”来表达，也是商务上常用的．

Answer 2

if there has been any questions, please contact me in no time(at once) .

Answer 3

It's the first that for more information please contact me.

Answer 4

Should there be any problem, please contact me as soon as possible.

Answer 5

don't hesitiate to contact me if you've got any questions