ive just been using my destruction spells like normal killing enemies as i play through the quests. im only 12 hours in and already level 40. im not knocking anyone that wants to level up your way, but doesnt that kinda take the fun out of it?
Started @ destruction level 60. It took 84 dual wielded flamebolts to level to 61 91 flamebolts to level to 62, taking 2:42 minutes Switched to flames, 2 handed. It took 4:50 to level to 63 Switched to 1H flame, took 3:40 to level to 64 Switched one handed flamebolts. It took 2:20 to level to 65 2:25 to level 66 2:30 to level 67 lost track to 68 switched to one hand on continuous frostbite, the other hand to flamebolts took just 1:31 to level 69 1:33 to level 70 Switched 1 hand to flames, other to frostbite and wielded both continuously. took 4:30 that way to L71 experimented with some other combos of 1H and 2H lightning spells, with no improvement
(Tapping 1H flames, the other frostbite as quickly as I could switch them back and forth was a disaster. tried it for about 8 minutes any leveling)
switched back to 1h frostbite, 1h flame-bolt up to L80 Took 2:40 to get from 80 to 81.
Stopped here to go back to the main quest.
Bottom line: The fastest way to level destruction appears to be with one hand doing continuous frostbite, the other doing quick flamebolts.
I'm pure mage and destruction kind of leveled on it's own. I got it to 90 and everything else was at 35-50.
Also, there's nothing wrong with wanting to level up quickly. Just like in real life, you can get better by practicing. I've been practicing Illusion and Alteration at the college and almost maxed them out.