Postgres 13

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CREATE TABLE ImportLogs( DateTimeStamp timestamp);

CREATE TABLE

insert into ImportLogs values ('2022-01-01 10:00:00'),('2022-01-01 10:00:05'),('2022-01-01 10:00:10');

INSERT 0 3

select 
  cast(
     max(DateTimeStamp) 
   - min(DateTimeStamp)
     as time) TimeDiffernce 
from ImportLogs

timediffernce

00:00:10

SELECT 1