Update copy speed estimation to 20 MB/s for more conservative progress

- Change copy speed estimation from 50 MB/s to 20 MB/s
- This accounts for slower USB drives and system overhead
- Prevents progress bar from jumping too quickly to high percentages
- Provides more realistic time estimates for the copy operation

autoinstaller_gui/autoinstallergui.py

@@ -749,10 +749,10 @@ class InstallerWorker(QThread):
             total_bytes = int(du_result.stdout.split()[0])
             self.log(f"Estimated total size to copy: {total_bytes} bytes ({total_bytes // (1024*1024)} MB)")
 
-            # Estimate copy time based on typical speeds (50-200 MB/s for modern systems)
-            # Use very conservative estimate of 50 MB/s for more realistic estimation
+            # Estimate copy time based on typical speeds (20-100 MB/s for USB drives)
+            # Use very conservative estimate of 20 MB/s for realistic estimation
             # This accounts for slower USB drives and system overhead
-            estimated_copy_time = total_bytes / (50 * 1024 * 1024)  # seconds
+            estimated_copy_time = total_bytes / (20 * 1024 * 1024)  # seconds
             self.log(f"Estimated copy time: {estimated_copy_time:.1f} seconds (conservative estimate)")
 
         except (subprocess.CalledProcessError, ValueError, IndexError):
@@ -1349,7 +1349,7 @@ class AutoInstallerGUI(QMainWindow):
         # Log Output - make it more compact
         self.log_text = QTextEdit()
         self.log_text.setReadOnly(True)
-        self.log_text.setMaximumHeight(120)  # Reduced from 150
+        self.log_text.setMaximumHeight(150)  
         layout.addWidget(self.log_text)
 
         # Copy Progress Output (small text area for rsync details) - make it more compact