By default mIRC setting this is bugged, for example on one network there are different servers. If the user is on a different server you will not see their idle time in /whois command, it will show nothing (no info).
To fix that problem follow these steps Tools -> Script Editor -> Popups Tab -> View -> Nick list.
Next is try to find this:
After finding this edit it like this:
To fix that problem follow these steps Tools -> Script Editor -> Popups Tab -> View -> Nick list.
Next is try to find this:
Info:/uwho $1
Whois:/whois $$1
Whois:/whois $$1
Info:/uwho $1 $1
Whois:/whois $$1 $$1
Whois:/whois $$1 $$1