Maximum value for inter parameter?

What is the maximum value for “inter” parameter in haproxy.cfg file?
I know by default inter parameter value is 2000ms but what about maximum value?

–> server backend 10.0.9.10:80 inter 1000 rise 3 fall 3 check

In my environment, i need to check the maximum value of ‘inter’ parameter. Is it fine to take 24hrs?

“24h” as value is fine.