What is the maximum queue depth for crontab in RHEL ?

Issue

• What is the default maximum number of cron task tracked in the queue ?
• Can that be configured like other Unix's using a /etc/cron.d/queuedefs file?

For example:

What happens if we add following line to /etc/cron.d/queuedefs.  
c.2000j20n60w 

would that set cron to  
2000 maximum jobs  
20 Nice level  
60 seconds between retries.