Benefits of a 90 minute boil?

[narcout]

Those sure are “carmel like” flavors I get when I do a boil down.

Yeah, it definitely adds some flavor.  To me, it tasted like butter toffee.

@gordonstrong

If you boil your first runnings hard when making a Scotch ale, you get more caramel flavors.  These aren’t the same flavors I get when I boil a decoction; those are a richer maltier flavor.

Do you have any insight into how the flavor you get from boiling down the first runnings compares to what you would get if you did an extended 3 or 4 hour full wort boil?