Considering that there will be some big sized grids next week, we have decided that submissions will now be accepted even after an hour. However, we didn't want to change the scoring system middle of the competition. So all submissions beyond an hour will be ignored from scoring point of view.
Note that this change is applicable irrespective of the size of the grids. So basically, the timer no more stops at 60:00.
Thanks PS and EMJ for bringing it up. I still think puzzles won't be too difficult, and will be solvable within an hour.