Just one Halacha that is applicable to Shavuot but actually applies all year round. The law of Milk and Meat. Since it is our custom to have milk on Shavuot and some have milk foods first, and then they have their official Seudah, which is meat, you have to be reminded of some laws, which apply between milk and meat. Now we know if you had meat, then you have to wait 6 hours before you have milk. According to the Halacha there is no time that you have to wait from milk to meat. Although the Kaf Hachayim says, from the Zohar that it’s proper to wait an hour. And the Arizal actually waited a full day between milk and meat, however, that is Midat Chasidut. From the law, all you have to do is wash your mouth out, and clean your hands, and of course change the tablecloth. And if there was bread that you were eating with the milk meal, you take the bread off the table, and you put on a new loaf of bread. More than that, you don’t have to do.
Some are careful to wait a half hour. Again, this is Midat Chasidut. From the law, you ate a piece of cheesecake. Now you are going to have your lunch, subsequently after that, so long as your cleaned and rinsed your mouth out, and you washed your hands and changed the tablecloth, according to the Halacha you can eat it immediately.
It should be pointed out however, when it comes to hard cheeses, the Halacha says "Gevina Kasha’, since it leaves a strong taste, then one would have to wait 6 hours after he ate the cheese, before he has meat. That would apply, Rav Elyashiv says, that applies today to let’s say, the yellow cheeses that we have, like the cheddar cheese or the strong cheeses that leave a strong taste. He’s not referring to the American cheese that we have, not that yellow cheese, that’s a process cheese and doesn’t have a strong taste. But the cheddar cheese and the old cheese, if they have the Kosher in the stores, then you would have to wait 6 hours. Otherwise, immediately after cheese, washing the mouth, cleaning the hands, changing the tablecloth and changing the bread, then you can eat it right away.
