If you really want that, then do all the trick that game engines out there use:
- Reduce/simplify the number of geometry of your scene.
- Apply all modifiers, there should be none active.
- Pre bake all your textures.
- Don’t use HDR textures at all.
- Pre bake all the lights.
- Disable SSS.
I’m sure (because also i’ve seen it) there’s more tricks you can do to have real-real-realtime. Same trickery worked to have times from offline renderers, the same applies here. I think somebody here will have more tweaks that can be done to allow full realtime. (and that are possible with EEVEE, unlike classic offlines render engines, that can be done realtime).
Good Luck.