One space.
There is a general American practice that if a dependent clause (incomplete sentence) follows the colon, the writer should insert one space; and if an independent clause (complete sentence) follows the colon, the writer should use two spaces. However, this is practice is generally seen as antiquated and is discouraged in professional-style manuscripts. One space is sufficient.
You insert one space after you have placed the colon.
I'd say one. Anymore makes it look sloppy, and so does no spaces. However, if your text is small, put two spaces or more as needed. It's really up to you, make it to your taste.
Spacing is always the same, regardless of the puntuation preceding the space.
There are no spaces after a colon when writing time; 3:15 p.m. is how it is written.
one
None. 8:00, 5:15 -- no spaces.
One.
In typing, proper style is 2 spaces after a period (.), as well as after a colon (:).
Just one
One.
1(:
One space after a semicolon.
There is one space after a semi colon: Example: I went to the store and forgot coffee; potatoes and milk.
There should be one space after a semi colon.
two should be left
1 space. from a student at ross middle school
I was taught it was two. A good way to remember this is by counting the dots on it. The colon has two so it has two spaces. A semi colon has only one dot, and it has only one space after it. But this only applies when the name of the punctuation has the word "colon" in it, as when you are counting the dots in a period, you only see one, but after a period, you usually put two spaces unless you are using a wesite address or something of that sort.