diff --git a/src/endpoints/levels/uploadLevel.cr b/src/endpoints/levels/uploadLevel.cr
index 96c91ae..053cdd2 100644
--- a/src/endpoints/levels/uploadLevel.cr
+++ b/src/endpoints/levels/uploadLevel.cr
@@ -45,6 +45,7 @@ CrystalGauntlet.endpoints["/uploadGJLevel21.php"] = ->(context : HTTP::Server::C
 
     level_raw_objects = Level.decode(params["levelString"])
     level_objects = Level.to_objectdata(level_raw_objects)
+    inner_level_string = level_raw_objects.find! { |obj| !obj.has_key?("1") && obj["kA9"]? == "0" }
     objects = level_objects.size
 
     forbidden_objects = config_get("levels.parsing.object_blocklist").as?(Array(TOML::Type))
@@ -91,12 +92,11 @@ CrystalGauntlet.endpoints["/uploadGJLevel21.php"] = ->(context : HTTP::Server::C
     coins = level_objects.count { |obj| obj.id == 1329 } # user coin id
 
     # todo: check if dual portals even exist?
-    two_player = false
-    level_raw_objects.each do |obj|
-      if !obj.has_key?("1") && obj["kA10"]? == "1"
-        two_player = true
-      end
-    end
+    two_player = inner_level_string["kA10"]? == "1"
+
+    # todo: currently brokey
+    #level_length_secs = Level.measure_length(level_objects, inner_level_string["kA4"]?.try &.to_i? || 0)
+    #LOG.debug { "level is #{level_length_secs}s long" }
   else
     objects = params["objects"].to_i
     coins = params["coins"].to_i
diff --git a/src/lib/level.cr b/src/lib/level.cr
index 31d0612..34a26d0 100644
--- a/src/lib/level.cr
+++ b/src/lib/level.cr
@@ -21,11 +21,11 @@ module CrystalGauntlet::Level
     end
     # the X position of the object
     def x
-      @raw["2"].to_i
+      @raw["2"].to_f
     end
     # the Y position of the object
     def y
-      @raw["3"].to_i
+      @raw["3"].to_f
     end
 
     # strings
@@ -293,4 +293,104 @@ module CrystalGauntlet::Level
   def gmd_parse(gmd_file : String)
     Level.array_to_hash(XML.parse(gmd_file).first_element_child.not_nil!.children.reject { |node| node.type == XML::Node::Type::TEXT_NODE }.map { |node| node.children.to_s})
   end
+
+  # heavily references https://github.com/TeamHaxGD/GDDocs/blob/master/algorithms/level_length.c
+  enum PortalSpeed
+    # 0.5x
+    Slow
+    # 1x
+    Normal
+    # 2x
+    Medium
+    # 3x
+    Fast
+    # 4x
+    VeryFast
+
+    def portal_speed
+      case self
+      when .slow?
+        251.16
+      when .normal?
+        311.58
+      when .medium?
+        387.42
+      when .fast?
+        478.0
+      when .very_fast?
+        576.0
+      else
+        0.0
+      end
+    end
+  end
+
+  def id_to_portal_speed(id : Int32)
+    case id
+    when 200
+      PortalSpeed::Slow
+    when 201
+      PortalSpeed::Normal
+    when 202
+      PortalSpeed::Medium
+    when 203
+      PortalSpeed::Fast
+    when 1334
+      PortalSpeed::VeryFast
+    end
+  end
+
+  def get_seconds_from_xpos(pos : Float64, start_speed : PortalSpeed, portals : Array(ObjectData))
+    speed = 0.0
+    last_obj_pos = 0.0
+    last_segment = 0.0
+    segments = 0.0
+
+    speed = start_speed.portal_speed
+
+    if portals.empty?
+      return pos / speed
+    end
+
+    portals.each do |portal|
+      s = portal.x - last_obj_pos
+
+      if pos < s
+        s /= speed
+        last_segment = s
+        segments += s
+
+        speed = id_to_portal_speed(portal.id).not_nil!.portal_speed
+
+        last_obj_pos = portal.x
+      end
+    end
+
+    return ((pos - last_segment) / speed) + segments;
+  end
+
+  def measure_length(objects : Array(ObjectData), ka4 : Int32)
+    start_speed = case ka4
+      when 0
+        PortalSpeed::Normal
+      when 1
+        PortalSpeed::Slow
+      when 2
+        PortalSpeed::Medium
+      when 3
+        PortalSpeed::Fast
+      when 4
+        PortalSpeed::VeryFast
+      else
+        PortalSpeed::Normal
+      end
+
+    max_x_pos = objects.reduce 0.0 { |a, b| Math.max(a, b.x) }
+
+    portals = objects
+      .select { |obj| id_to_portal_speed(obj.id) && obj.checked }
+      .sort { |a, b| a.x <=> b.x }
+
+    get_seconds_from_xpos(max_x_pos, start_speed, portals)
+  end
 end