php - default timeout for cron in ubuntu -

php - default timeout for cron in ubuntu -

i have php script 4 hours task, online services cron runs script 300sec or limited time thought should run cron on ec2 instance, question ,

is there default timeout cron, if cron runs run upto completion of script?

is there library or setting cron rather going through putty/ssh?

i got mixed answers on google,therefore asking,

php ubuntu amazon-ec2 cron exec