No no no, yes :D i could be more explanatory here is the link
https://forum.corona-renderer.com/index.php/topic,1012.0.htmlWhat i want to say to you, by looking your material, your white is too white...
Basically nothing is white 255.255.255 so if you make bunch of materials in your scene too white it will make your render times higher. So instead using 255 for white you should use 170.170.170 or use 255.255.255 and set level for diffuse to 0.7.
What are you referring is albedo element it is used just so it make it easier for you observing what has high albedo by showing it in red(you can switch to it in corona VFB)
Please read about it as it is well explained in forums.
Also this is just as starting point and one possible reason of your high render times and it is reasonable to expect render times going up when you use translucency, caustics or scene with more complex GI or materials.