Its means that we will have a campaign period of 13 days (precisely, 12 days and 13 hours as campaign can legally begin only at 11 pm after the nomination completes). The whole election period, counting from parliamentary dissolution to polling day, would be 25 days.
Looking at it positively, these are the longest campaign period and election period since 1986 (inclusive).
Putting into context, a 13-days campaign period is only 61% of what BERSIH demands and less than 1/3 of what the British gave us in 1955.
Should we be happy? Is a question that whether you want to see the glass of water as half full or half empty.