Originally posted by OctoberSky:

As you progress through the 30's and 40's you can find yourself spending days parked by greydwarf spawners but using the resting bonus can significantly improve that.

Days... depends how efficient a farm you can have and how many hours a day you play. :p If the skeletts can attack every 3 seconds, the whole process in an ideal scenario should take less than 3 hours. It's faster and easier than leveling up blocking because you only need to buff the skeletts every minute or so with the barrier and let them hack away, if you so choose. And the only goal with speed-tracking progress to 45-50 blood is to gain the ability to summon skeletts with just one eitr food. There's hardly any downside in consuming two eitr food and going full mage so all in all it's a non-issue.