Find the difference between two dates Teradata

Question

I have a dataset with ID, Date and Sts

 ID     SDate         EDate       Sts
101     7/18/2023      7/18/2023  01  
101     7/19/2023      7/18/2023  01
101     7/20/2023      7/20/2023  02
101     7/21/2023      7/21/2023  03

I need to calculate the number of days between

   When ‘SDate=‘Edate and STS ne ‘01’ - 
   When ‘SDate=‘EDate and STS=‘01’

In the above case it should be 7/20/2023-7/18/2023 = 3 days

I have created separate datasets for STS=‘01’ and STS ne ‘01’ and joining on ID and look for date difference > 0

Is there an efficient way using ‘Windows functions?

Thanks