Meditating can actually help! I used to do it everyday during vacation.
It freshes up your mind
I won't be effective if you are not practicing it daily.I won't take lot of time to do and initially it will look like difficult thing but once you made it a habit then you can feel the real change.
When I started meditating it was a very difficult thing for me until I made it regular activities! I find it very difficult to meditate consecutively for a week on a daily basis but I have to force myself having knowing the importance of meditation. Today, it has become a habit to me and without meditating I hardly go out of the house.
When we are doing it rightly and attains the relaxed state with full concentration then 10 to 15 mins of meditation is enough for a days and in the evening we may do it again if we got the time but the best time to do is at the time of sun rise.