[blu]

Sorry, a search warrant has no time limits, it is always required when a home/business/whatever is being searched. Same applies to arrest warrants. No time limits.

[Andy from Chapel Hill]

This was discussed in detail when Manifort’s apartment was raided pre-dawn. A Federal arrest warrant apparently needs an additional approval if it is to be executed pre-dawn.

Manifort’s warrant did not have this approval.

[Andy from Chapel Hill]

These are more properly called “No-knock Warrants”

See:
https://en.wikipedia.org/wiki/No-knock_warrant

They are different than usual warrants.

[DrDude]

A search Warrant lists specific dates. when the dates are exceeded you need to obtain another Search Warrant. Specific dates and times are mandatory. No such thing as an unlimited search warrant.