MinutesPerDay - Does .NET have anything for it? Looking at a code review at work for a Win32 C# code I am seeing some lines like this:

int MinutesPerDay = 1440;
int MinutesPerWeek = 10080;
int MinutesPerMonth = 43200;


and so on ...

I am not sure what is wrong with it but still I feel this is not a good code and design? What do you guys think? Could he do it in a better way?
Since these are constants, I would declare them as such. Also, making the calculation explicit would be more informative.

private const int MinutesPerDay = 24 * 60;
private const int MinutesPerWeek = 7 * MinutesPerDay;
private const int MinutesPerMonth = 30 * MinutesPerDay;