Map completion
How long depends on you. It does involve WvW, so that will likely take some time to get into everywhere as your server controls it. Doent take a real commitment really, you can just do it as you want. The worst area in PvE is probably Orr.
For professions, I had no problem doing it solo with Thief and Guardian. Elementalist needed a partner for some things.
I say go for it, just don’t treat it like a job. Do a map or two a day and it’ll be done before you know it. Check the WvW status window and go in to get what you need when your server controls it……………………do not leave WvW for last. Its horribly frustrating when everything else is done and you’re waiting on WvW.