diff --git a/PerfectNumbers.Core/PrimeOrderCalculator.cs b/PerfectNumbers.Core/PrimeOrderCalculator.cs
index 9affb44..24c0511 100644
--- a/PerfectNumbers.Core/PrimeOrderCalculator.cs
+++ b/PerfectNumbers.Core/PrimeOrderCalculator.cs
@@ -18,8 +18,8 @@ internal static partial class PrimeOrderCalculator
 
     internal readonly struct PrimeOrderSearchConfig(uint smallFactorLimit, int pollardRhoMilliseconds, int maxPowChecks, PrimeOrderMode mode)
     {
-        public static PrimeOrderSearchConfig HeuristicDefault => new(smallFactorLimit: 4_000_000, pollardRhoMilliseconds: 24 * 2048, maxPowChecks: 24, PrimeOrderMode.Heuristic);
-        public static PrimeOrderSearchConfig StrictDefault => new(smallFactorLimit: 1_000_000, pollardRhoMilliseconds: 0, maxPowChecks: 0, PrimeOrderMode.Strict);
+        public static readonly PrimeOrderSearchConfig HeuristicDefault = new(smallFactorLimit: 4_000_000, pollardRhoMilliseconds: 24 * 10_240, maxPowChecks: 24, PrimeOrderMode.Heuristic);
+        public static readonly PrimeOrderSearchConfig StrictDefault = new(smallFactorLimit: 1_000_000, pollardRhoMilliseconds: 0, maxPowChecks: 0, PrimeOrderMode.Strict);
 
         public readonly uint SmallFactorLimit = smallFactorLimit;
         public readonly int PollardRhoMilliseconds = pollardRhoMilliseconds;