Limits

Item Limit
HTTP
Request duration None
Request and response size None
Simultaneous connections None
Simultaneous instances of a site 1, including during a restart
Idle time before a site is stopped 30 minutes by default, configurable
Processes
Delay between SIGTERM and SIGKILL 30 seconds
Outgoing connection ports No filtering
Scheduled tasks
Minimum interval 1 minute
Execution duration None
Simultaneous executions of the same task 1

Resources (CPU, memory, disk space) depend on the plan: Public Cloud, Private Cloud.