diff --git a/ReadMe.md b/ReadMe.md
index 7764919..6f4e219 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -37,19 +37,23 @@ Licensing? I don't care. Do whatever you want. IP rights are stupid.
   "series": "Series",
   "genre": "Fiction",
   "pages": 100,
+  "hours": 1.5,
   "priority": 0,
   "progress": 0.5,
   "hidden": true
 }
 ```
 
-- `title`, `author`, `series`, `pages`, `genre`, and `hidden` are optional.
+- `title`, `author`, `series`, `pages`, `hours`, `genre`, and `hidden` are
+  optional.
 - At least one of `title`, `author`, `series`, or `genre` must be defined.
 - `priority` is the ELO ranking, initializing to `0`.
 - `progress` represents read/unread/in-progress status. `0` is unread, `1` is
   read, and anything in-between in a percentage of progress.
 - `hidden` is undefined or `true` to hide a book from ALL of the interface
   without deleting its data.
+- `hours` is hours.minutes rather than the fractional part being percentage of
+  an hour.
 
 Despite the script supporting otherwise, I highly recommend only using this for
 *specific book titles*. In my experience, using entries representing multiple
diff --git a/asymptome.lua b/asymptome.lua
index 20d8c2f..ce2129c 100755
--- a/asymptome.lua
+++ b/asymptome.lua
@@ -81,7 +81,10 @@ local get_display_name = function(book)
   end
 
   if book.pages then
-    result = result .. " ~" .. math.floor(book.progress * book.pages) .. "/" .. book.pages .. " pages read"
+    result = result .. " ~" .. math.floor(book.progress * book.pages) .. "/" .. book.pages .. " pages read (" .. math.floor(book.progress * 100) .. "%)"
+  elseif book.hours then
+    -- TODO correct for the fractional part being minutes instead of percent
+    result = result .. " ~" .. math.floor(book.progress * book.hours * 10) / 10 .. "/" .. book.hours .. " hours listened (" .. math.floor(book.progress * 100) .. "%)"
   elseif book.progress > 0 and book.progress < 1 then
     result = result .. " ~" .. math.floor(book.progress * 100) .. "% read"
   end
diff --git a/lib/filters.lua b/lib/filters.lua
index 108cccb..d69401a 100644
--- a/lib/filters.lua
+++ b/lib/filters.lua
@@ -31,6 +31,13 @@ local filters = {
     end
     return true
   end,
+  audiobooks_only = function(book)
+    if book.hidden then return false end
+    if book.hours then
+      return true
+    end
+    return false
+  end,
 }
 
 return filters
diff --git a/lib/sort_orders.lua b/lib/sort_orders.lua
index 36fb273..c65224b 100644
--- a/lib/sort_orders.lua
+++ b/lib/sort_orders.lua
@@ -27,6 +27,17 @@ sort_orders = {
   fewest_pages_remaining = function(A, B, data)
     return not sort_orders.most_pages_remaining(A, B, data)
   end,
+  most_time_remaining = function(A, B)
+    if not (A.hours and B.hours) then -- fallback to percentage
+      return A.progress < B.progress
+    end
+    local a = A.hours - A.hours * A.progress
+    local b = B.hours - B.hours * B.progress
+    return a > b
+  end,
+  least_time_remaining = function(A, B)
+    return not sort_orders.most_time_remaining(A, B)
+  end,
 }
 
 return sort_orders