delelte dirs older than 2 hours by find with solaris 9

Hi!

I run Solaris 9 and want to delete some directories older than 2
hours. Like this:

find /MYDIR/ -name "MYPATTERN" -type d -mmin +120 -exec rm -R {} \;

But there ist no option like "mmin" in Solaris 9, I can only select
files older than whole days by "-mtime", but not by hours.

Is there someting like "gnu-find" I can use oder another way to
select files accessed some hours ago?

Thanks!
.