Don’t panic, your ad performance and clicks won’t be affected. Just you cannot login to the account for four hours due to the Google’s site maintenance.
Here’s the start time in a few international cities:
London – 6pm Saturday
Johannesburg – 8pm Saturday
Madurai – 11:30pm Saturday
Manila – 2am Sunday
Sydney – 5am Sunday
They have mentioned madurai which is located at tamilnadu in India. So in India we cannot access account in the early morning 2 AM to 6 AM.
Source: Google Adsense Blog
