Whether you are a trophy pusher, a clan war god, or just a casual player, you should notice that the most powerful strats require spells to work decently. Spells, however, take nearly twice as long as the army that you are using them for! A standard GoWiPe army for me takes a minimum of 55 minutes to completely train, while spells take 2 hours and 15 minutes (That's over twice as long!). Most people will tell you to only boost the spell factory, but sometimes you don't have the gems to boost a spell factory for one war attack, or you don't want to. These are some suggested times for spells that would help get people raiding more often:

Lightning Spell: 20 minutes

Heal Spell: 25 minutes

Rage Spell: 30 minutes

Jump Spell 35 minutes

Freeze Spell: 40 minutes

I believe with these times it is not as time-consuming, yet still fair for the fact that the higher tier spells still take longer than the lower tier spells.

In conclusion, spells take too dern long!