6、写这个邮件花了你多少时间？（译成英语）

How long does it take you to write the mail?
另：写这个电子邮件花了你多少时间 ？
How long does it take you to write the e-mail?

How long did it take you to write this e-mail?
或者
How long did you spend on (writing)this e-mail?

How much time did it take you to write this mail?
How long did you spend on this mail?

How much time does it take you to write the mail?

How long did you spend on this mail?

how long it takes you 2 write an e-mail?