Fill in with your columns and specific dates.
This solution uses two queries and combines their result. First part is for up to 25 orders for the first 5 days of the month while latter is for up to 25 orders for the last 5 days of the month.
select *
from (
select *
from orders
where datecolumn between 'start of month' and 'start of month' + interval '5 days'
order by datecolumn asc
limit 25
) t1
union all
select *
from (
select *
from orders
where datecolumn between 'end of month' and 'end of month' - interval '5 days'
order by datecolumn desc
limit 25
) t2
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