DiabloFans

If the devs wanted people to do this more than once a week they could have:

a) give a reward each time you set a personal best (that beat the timer). Since you have to beat your own best time there is diminishing rewards.

have multiple challenge rifts available at the same time -- one for each class, each lasting a week, each changing on a different day of the week. This turns them into daily events, but doesn't punish the person who only plays a couple time a week.

A level 25 GoE takes about 15-20 minutes to make. Just do five level 35 greater rifts. Each rift should take 3 minutes (or less).

Here is a sample build out for leveling https://www.d3planner.com/206478252 the rare gear is level 23 Cain set.

The legendary gems I use hoarder + two others (toxin for DoT that helps with kill streaks and gizzard to the shield).

It can get to level 55 with a single T6 vault run.

After 70, I plan on either make a LoN build with ancients from other sets or use the cube upgrade rares to get necro gear.

Depending on how much of the content you want to enjoy, for those who are planning to go through the campaign in NS and enjoy the gear they drop I suggest a few things:

1. Don't wear Leoric's Crown, just cube it. That way you can use what ever helm (esp the necro specific ones) that drops with a socket.

2. Don't use an ancient weapon with GoE until higher levels and only if you don't drop a decent weapon. Use Furnace and CoE in cube so that you get a bit of a damage boost with using found weapons.

3. Use a HF ring with a high amount of +damage range, vit, life regen... put a high level gizzard in it. It'll keep you alive at Torment difficulties.

Should get one to 70 or relatively close by the end of the campaign whilst playing at Torment difficulties.