tSQL multiple date ranges in one query

I need to create table with 3 different time ranges

(ONE) Targets table had TargetID as PK
to
(MANY) Visits table has TargetID

I am getting counts of targets and Business in the visit table..
How could I create it so there is a column for 30 days 60 days and 90 Days


The code below works for 30 days but i want it to have 2 more columns for 60 days and 90 days

any suggestions would be greatly appreciated

Select t.BusinessUnitID, Count(1) as Days30
from dbo.Targets t (nolock)
inner join dbo.VIEW_Visits vv (nolock) 
on vv.CreationTime > getdate()-30
and t.TargetID = vv.TargetID  
and t.businessUnitID in (9,18,1)
Group by  t.BusinessUnitID

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