After generating the domain model from the database you can select the particular property in the designer and change the CLR type of this property to 'TimeSpan' in the properties window. 'TimeSpan' is not listed there but you can just type it in.
Querying for data should then give you TimeSpan values.
@Chris - You should change the CLR type in the designer and save the rlinq file. This will generate the right CLR type in the code. Do not change the generated code directly because this is always regenerated everytime you save the rlinq file.
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