diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_OilDrillBase.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_OilDrillBase.java
index 6e7c0f4f..5d760e62 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_OilDrillBase.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_OilDrillBase.java
@@ -79,7 +79,7 @@ public abstract class GT_MetaTileEntity_OilDrillBase extends GT_MetaTileEntity_D
         this.mEfficiencyIncrease = 10000;
         int tier = Math.max(1, GT_Utility.getTier(getMaxInputVoltage()));
         this.mEUt = -3 * (1 << (tier << 1));
-        this.mMaxProgresstime = (workState == STATE_AT_BOTTOM ? 320 * getRangeInChunks() * getRangeInChunks() : 80) / (1 << tier);
+        this.mMaxProgresstime = (workState == STATE_AT_BOTTOM ? (1280 * getRangeInChunks() * getRangeInChunks() / (1 << getMinTier())) : 80) / (1 << tier);
         this.mMaxProgresstime = Math.max(1, this.mMaxProgresstime);
     }