Shield duration needs to be lowered

In this thread I'll take a look at your favorite support champions, and and their shield abilities.

Let's start with Janna's E (Eye of the Storm). At max rank it has a 10 seconds cooldown (6 seconds with 40% CDR). And the shield lasts for 5 seconds. So there is a 1 second window where you can burst the ADC. You heard me right, 1 second. For 1 second the enemy ADC won't have a 210 + 70% AP shield on them that also gives them AD.

Now, let's take a look at Lulu's E (Help, Pix!). It has a 10 seconds cooldown at all ranks (6 seconds with 40% CDR). And the shield lasts for 6 seconds. So there is a 0 seconds window when the ADC won't have 210 + 60% AP shield on them. But doesn't this mean Lulu can perma-shield someone? Yes, it does.

You may think that the shields aren't that strong since supports don't get a lot of AP. However, items like (2300 gold) (2100 gold) (2100 gold) give % heal and shield power that stack with each other. We also have Summon: Aery that gives an extra 30-80 + 25% AP shield. And if that isn't enough, you can also take Revitalize from the Resolve tree that increases your heal and shield power by 5% or 10% if you are below 40% health. I thought shields were meant to negate burst and supports should be punished when they use their shield too early or too late. But if the shield lasts so long and the cooldown is so short you can't possibly misuse the shield. There isn't a good time to use a shield, it's always a good time to use a shield.