I have a table in SQL Server 2008 with data below:

```
user ,number of request, date number of request

user1, ID1139151, 2017-03-15 13:10:01.000

user1, ID1139152, 2017-03-13 14:31:05.000

user2, ID1139153, 2017-03-16 10:38:08.000

user2, ID1139154, 2017-03-16 09:26:04.000

user2, ID1139155, 2017-03-17 18:09:15.000

user2, ID1139156, 2017-03-17 20:14:29.000

user2, ID1139157, 2017-03-28 11:18:18.000

```

Help me to find a summ of days by every user with help of SQL query.

```
Result:

user, date number of request

user1, 2

user2, 3

```

**Script to create data :** 

```
CREATE TABLE Mytable (

   [user] varchar(50) NOT NULL,

   [number of request] varchar(15) NOT NULL,

   [date_number_of_request] datetime NOT NULL,     )

INSERT INTO Mytable  

VALUES 

('user1','ID1139151','2017-03-15 13:10:01.000'),

('user1','ID1139152','2017-03-13 14:31:05.000'),

('user2','ID1139153','2017-03-16 10:38:08.000'),

('user2','ID1139154','2017-03-16 09:26:04.000'),

('user2','ID1139155','2017-03-17 18:09:15.000'),

('user2','ID1139156','2017-03-17 20:14:29.000'),

('user2','ID1139157','2017-03-28 11:18:18.000');

```