Update sample hold durations to realistic second values

Now that duration is correctly read as seconds, bump the sample
schedule's hold steps from the placeholder 30-40s to more realistic
200-400s.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sude/sud_0010.json

@@ -26,7 +26,7 @@
 		{
 			"type": "hold",
 			"descr": "Einmaischen Rast",
-			"duration"	:  30,
+			"duration"	:  200,
 			"stirrer_speed": 30,
 			"stirrer_time_on": 30,
 			"stirrer_time_off": 30
@@ -43,7 +43,7 @@
 		{
 			"type": "hold",
 			"descr": "Halten Glucose-Rast",
-			"duration"	:  40,
+			"duration"	:  400,
 			"stirrer_speed": 30,
 			"stirrer_time_on": 30,
 			"stirrer_time_off": 30
@@ -60,7 +60,7 @@
 		{
 			"type": "hold",
 			"descr": "Halten Verzuckerungs-Rast",
-			"duration"	:  30,
+			"duration"	:  300,
 			"stirrer_speed": 30,
 			"stirrer_time_on": 30,
 			"stirrer_time_off": 30
@@ -77,7 +77,7 @@
 		{
 			"type": "hold",
 			"descr": "Halten Abmaischen",
-			"duration"	:  30,
+			"duration"	:  300,
 			"stirrer_speed": 30,
 			"stirrer_time_on": 30,
 			"stirrer_time_off": 30,