hardening off

hardening off

I was wondering what everyone's method is to harden off their seedlings before transfering them outside? I'm in zone 6, with my last frost date projected to be around May 4-8. I have broccoli, lettuce, tomatoes, peppers and eggplant growing indoors. I was wondering: 1. Could I begin the hardening off process now? 2. How long I should leave them outdoors each day? Any other info or tips would be greatly appreciated! Thanks!
A Work in Progress

A Work in Progress

Now some veggies.

Now some veggies.

The Apartment at 61!

The Apartment at 61!

Salut, salut!

Salut, salut!

Gift tags…

Gift tags…

3 garden pictures behind cut

3 garden pictures behind cut