We can use below script for finding the archive log generation per hour on each day.

Script:

set pagesize 120; 
set linesize 200; 
col day for a8; 
spool archivelog.lst
PROMPT Archive log distribution per hours on each day
  

select 
  to_char(first_time,'YY-MM-DD') day, 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'00',1,0)),'999') "00", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'01',1,0)),'999') "01", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'02',1,0)),'999') "02", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'03',1,0)),'999') "03", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'04',1,0)),'999') "04", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'05',1,0)),'999') "05", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'06',1,0)),'999') "06", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'07',1,0)),'999') "07", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'08',1,0)),'999') "08", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'09',1,0)),'999') "09", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'10',1,0)),'999') "10", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'11',1,0)),'999') "11", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'12',1,0)),'999') "12", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'13',1,0)),'999') "13", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'14',1,0)),'999') "14", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'15',1,0)),'999') "15", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'16',1,0)),'999') "16", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'17',1,0)),'999') "17", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'18',1,0)),'999') "18", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'19',1,0)),'999') "19", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'20',1,0)),'999') "20", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'21',1,0)),'999') "21", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'22',1,0)),'999') "22", 
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'23',1,0)),'999') "23", 
  COUNT(*) "TOTAL GENERATED"
from v$log_history 
group by to_char(first_time,'YY-MM-DD') 
order by day desc ;