diff --git a/.github/workflows/scala.yml b/.github/workflows/scala.yml
index 2d51e2d..b7c19a0 100644
--- a/.github/workflows/scala.yml
+++ b/.github/workflows/scala.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        scala: [2.12.18]
+        scala: [2.12.19]
         java: [adopt@1.11, adopt@1.8]
     runs-on: ubuntu-latest
     steps:
diff --git a/build.sbt b/build.sbt
index 9c584f7..fae8cb3 100644
--- a/build.sbt
+++ b/build.sbt
@@ -14,7 +14,7 @@ inThisBuild(
 lazy val root = (project in file(".")).settings(
   name := "sbt-test-shards",
   organization := "com.github.reibitto",
-  scalaVersion := "2.12.18",
+  scalaVersion := "2.12.19",
   sbtPlugin := true,
   libraryDependencies ++= Seq(
     "org.scalameta" %% "munit" % "0.7.29" % Test,
diff --git a/project/build.properties b/project/build.properties
index e8a1e24..04267b1 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.7
+sbt.version=1.9.9
diff --git a/src/main/scala/sbttestshards/ShardingAlgorithm.scala b/src/main/scala/sbttestshards/ShardingAlgorithm.scala
index 06ea81c..29b65a6 100644
--- a/src/main/scala/sbttestshards/ShardingAlgorithm.scala
+++ b/src/main/scala/sbttestshards/ShardingAlgorithm.scala
@@ -50,7 +50,7 @@ object ShardingAlgorithm {
     ): Balance =
       ShardingAlgorithm.Balance(
         JUnitReportParser.parseDirectoriesRecursively(reportDirectories).testReports.map { r =>
-          SpecInfo(r.name, Some(Duration.ofMillis(r.timeTaken.toLong)))
+          SpecInfo(r.name, Some(Duration.ofMillis((r.timeTaken * 1000).toLong)))
         },
         shardsInfo,
         fallbackShardingAlgorithm
diff --git a/src/test/scala/sbttestshards/ShardingAlgorithmSpec.scala b/src/test/scala/sbttestshards/ShardingAlgorithmSpec.scala
index 9d7a5a1..c673a13 100644
--- a/src/test/scala/sbttestshards/ShardingAlgorithmSpec.scala
+++ b/src/test/scala/sbttestshards/ShardingAlgorithmSpec.scala
@@ -13,7 +13,7 @@ class ShardingAlgorithmSpec extends ScalaCheckSuite {
   implicit val specInfoArbitrary: Arbitrary[SpecInfo] = Arbitrary {
     for {
       specName  <- Gen.resize(30, Gen.alphaStr)
-      timeTaken <- Gen.choose(0L, 9 * 60 * 1000)
+      timeTaken <- Gen.choose(0L, 5 * 60 * 1000)
     } yield SpecInfo(specName, Some(Duration.ofMillis(timeTaken)))
   }
 
@@ -50,4 +50,67 @@ class ShardingAlgorithmSpec extends ScalaCheckSuite {
     }
   }
 
+  property("only choose shard if initialDuration indicates node started early") {
+    forAll { (tests: List[SpecInfo]) =>
+      val initialDurations = Map(0 -> Duration.ofMinutes(-1000))
+      val algo = ShardingAlgorithm.Balance(tests, ShardingInfo(3, initialDurations))
+
+      val bucketMap = algo.distributeEvenly.toSeq.groupBy(_._2).map { case (k, v) =>
+        k -> v.map(_._1.timeTaken).reduceOption(_.plus(_)).getOrElse(Duration.ZERO)
+      }
+
+      if (tests.isEmpty)
+        bucketMap.isEmpty
+      else
+        bucketMap.keys.toSeq == Seq(0)
+    }
+  }
+
+  property("not choose shard if initialDuration exceeds the available time") {
+    forAll { (tests: List[SpecInfo]) =>
+      val initialDurations = Map(0 -> Duration.ofMinutes(1000))
+      val algo = ShardingAlgorithm.Balance(tests, ShardingInfo(3, initialDurations))
+
+      val bucketMap = algo.distributeEvenly.toSeq.groupBy(_._2).map { case (k, v) =>
+        k -> v.map(_._1.timeTaken).reduceOption(_.plus(_)).getOrElse(Duration.ZERO)
+      }
+
+      !bucketMap.contains(0)
+    }
+  }
+
+  test("take initialDurations into account when distributing specs") {
+    val initialDurations = Map(0 -> Duration.ofSeconds(10))
+    val tests = List(
+      SpecInfo("spec1", timeTaken = Some(Duration.ofSeconds(1))),
+      SpecInfo("spec2", timeTaken = Some(Duration.ofSeconds(2))),
+      SpecInfo("spec3", timeTaken = Some(Duration.ofSeconds(3))),
+      SpecInfo("spec4", timeTaken = Some(Duration.ofSeconds(4))),
+      SpecInfo("spec5", timeTaken = Some(Duration.ofSeconds(5))),
+      SpecInfo("spec6", timeTaken = Some(Duration.ofSeconds(6))),
+      SpecInfo("spec7", timeTaken = Some(Duration.ofSeconds(7))),
+      SpecInfo("spec8", timeTaken = Some(Duration.ofSeconds(8))),
+      SpecInfo("spec9", timeTaken = Some(Duration.ofSeconds(9)))
+    )
+
+    val algo = ShardingAlgorithm.Balance(tests, ShardingInfo(3, initialDurations))
+
+    val bucketMap = algo.distributeEvenly.toSeq.groupBy(_._2).map { case (k, v) =>
+      k -> v.map(_._1.timeTaken).reduceOption(_.plus(_)).getOrElse(Duration.ZERO)
+    }
+
+    val bucketMapWithInitialDurations = bucketMap.map { case (k, v) =>
+      k -> initialDurations.getOrElse(k, Duration.ZERO).plus(v)
+    }
+
+    assertEquals(
+      bucketMapWithInitialDurations,
+      Map(
+        0 -> Duration.ofSeconds(19),
+        1 -> Duration.ofSeconds(18),
+        2 -> Duration.ofSeconds(18)
+      )
+    )
+  }
+
 }