Sorry, but this is simply nonsense. I suspect that the respondents thought they were being asked how long they spent dealing with e-mails in general. Spam is much easier and quicker to deal with than snail junk-mail - one press of the Delete key and it is gone. Most of it can be recognised from the title alone; the rest can be deleted after a glance at the contents.
There is a lot of rubbish written about spam on the Net, most of it by people who need a windmill to tilt at or a cause to fight. The only people who are really inconvenienced by spam are the ISPs, who find themselves inadvertent hosts, and they are becoming very good at dealing with it.
As for the rest of us, we should relax and ignore it. I visit many Usenet groups and all sorts of Web sites without feeling the need to disguise my e-mail address; deleting the occasional invitation to make money for nothing is not much of a price to pay.
Correspondence should be e-mailed to email@example.com or posted to Feedback, Network+, The Independent, One Canada Square, Canary Wharf, London E14 5DL.