TimeSpan parse method (part of the info from msdn)

Here is format of input string :

[ws][-]{ d | [d.]hh:mm[:ss[.ff]] }[ws]

Items in square brackets ([ and ]) are optional; one selection from the list of alternatives enclosed in braces ({ and }) and separated by vertical bars (|) is required; colons and periods (: and .) are literal characters and required; other items are as follows.

Item	Description
ws	optional white space
"-"	optional minus sign indicating a negative TimeSpan
d	days, ranging from 0 to 10675199
hh	hours, ranging from 0 to 23
mm	minutes, ranging from 0 to 59
ss	optional seconds, ranging from 0 to 59
ff	optional fractional seconds, consisting of 1 to 7 decimal digits

The components of s must collectively specify a time interval greater than or equal to MinValue and less than or equal to MaxValue.

days , hours , minutes , but what if it's required to have timespan in a weeks, month , years ?
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