COSC certified watches have a criteria of -4/+6 per day; METAS criteria has a 0/+5 secs per day. When comparing a Seiko 5 which has -35/+45 secs per day, to a Daytona with -2/+2 secs per day, and a Grand Seiko Spring Drive with +/-1 sec per day. 😆 (all currently reported in respective brand websites).