Trash empty speed

I am running a Rube Goldberg backup system with a 32G USB key and Time Machine.
Every week I run TM and then copy the file over to the USB key so that I can carry around my backup if necessary. In order to copy over a backup from TM I first need to delete the previous backup from the USB key.
Then I have to empty the trash in order to copy over the next TM backup to the USB key(I don't understand why). Empying the trash takes a long time due to the large number of files in the backup.
Is it possible to empty the trash faster, without OS X seemingly having to delete each file in the backup?
Is this a stupid way to have a portable backup system not in the cloud?
Thanks,
Bart

I have millions of small files I need to delete. It's taking a very very long time for the Finder just to count how many files there are to trash.
Would there be a way to use Terminal amd the rm command to delete the entire trash folder instantly?
NO!
While the 'rm' command would not need to count the files, it would still have to do all the file system bookkeeping involved in moving allocated space to free space lists in the file system.
This may run slightly faster than the Finder, but never instantly.

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