Update idle time configuration and documentation

- Increased default values for IDLE_MINUTES from 30 to 60 and IDLE_GRACE_MINUTES from 45 to 90 across configuration files and documentation.
- Updated related documentation to reflect the new default idle time settings, ensuring consistency in user guidance and system behavior.

src/gpu_rent/remote/idle_killer.py

@@ -18,7 +18,7 @@ ARMED = DATA / ".gpu-rent-killer-armed"
 LOG = DATA / ".gpu-rent-killer.log"
 SERVER_ID_FILE = DATA / ".gpu-rent-server-id"
 # After this many seconds of continuous Swarm unreachable → treat as idle (don't bill forever).
-SWARM_UNREACHABLE_IDLE_SEC = 60 * 60
+SWARM_UNREACHABLE_IDLE_SEC = 2 * 60 * 60
 
 
 def log(msg: str) -> None:
@@ -242,7 +242,7 @@ def main() -> int:
 
     now = time.time()
     grace_from = float(creds.get("grace_from") or 0)
-    grace_minutes = float(creds.get("grace_minutes") or 45)
+    grace_minutes = float(creds.get("grace_minutes") or 90)
     if now < grace_from + grace_minutes * 60:
         left = int(grace_from + grace_minutes * 60 - now)
         log(f"grace {left}s left")
@@ -269,7 +269,7 @@ def main() -> int:
         log(f"busy: {llm_detail}")
         return 0
 
-    idle_minutes = float(creds.get("idle_minutes") or 30)
+    idle_minutes = float(creds.get("idle_minutes") or 60)
     since = read_ts(IDLE_SINCE)
     if since is None:
         write_ts(IDLE_SINCE, now)