You could save your battery life instead of digging deep into "Setting" and just to turn On/Off your Wifi. You actually consume a thousand minutes just for this matter. There is only two solution regarding above matter.

First Solution

A mini application known as “WifiToggle” allows you to toggle the Wifi directly on the Home screen. See more details about WifiToggle here.

Second Solution

The second solution is turn on/off your Wifi using SBSettings. SBSettings is a full replacement of BossPrefs and it brings all important toggles (which may be hidden under Settings) directly into your iPhone Home Screen. SBSettings also provides shortcut buttons to turn On/Off your WIFI. SBSettings also lets you control the toggles via a configuration screen. See more details here on how to install and how to use SBSettings.