Just noticed my GF alt is 68 and thinking of getting him to 70 when I'm not doing anything on my main. He needs all the boons from basically everywhere, so it'll be months of just solo content on him. Right now he's built as Iron Vanguard -Protector paragon with a little tactician because when I started the game I thought that was the tanking tree for GF's before I made what is now my main. I saw I still had the free respec I haven't used on him.
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Answers
Spend a respec token now on your GF for a Conqueror DPS build.
Wait until Loadouts come out and use that extra slot for a soloing Conqueror DPS build.
In either case, for the actual build, I'd reccomend SK Guardian's DPS GF build, but I'd avoid getting fancy gear pieces like an Orcus set or Relic weapon. Pick simple things, like Lostmauth Cloak/Imperial Dragon Cloak + Lostmauth Belt/STR belt, and you should be fine throughout the campaign boons. Bonding Runestones off alts/low budget DPS gear will also be of great help to speeding you through the campaigns.
About campaign progress: most take about a month to two months to complete, with some exceptions. Here's my thoughts/progression through the campaigns:
If you're going only up to boon 5, then it becomes a "simple" 2-3.5 month campaign with long and somewhat difficult quests.
If you're going for a full boon clear, then it becomes the worst campaign in the game. It literally took me 2.5 years to get the final boon for free, and that's counting multiple 2x ToD currency events.
Of all the campaigns, I think that Tyranny of the Dragons is the best one to use the campaign completion token, as that gives you all your boons , no questions asked. I'd honestly find it much easier to grind out AD and turn it to Zen than try and finish up the entire ToD campaign on another alt.
If you do this, make sure you buy the token when you have a 15% off coupon or when a special sale is active.