Well, 7140 are not that many. Well, depending on you hardware, OS, FS, that is.

It also depends on how big the input files are. If they are say 10 Mb each (not that unreasonable), then you will have 10 * 33 * 7140 Mb = 2.25 Tb of disk usage for the output files. That is a lot of disk space IMO.

One still wonders why you have to do this and if there could not be alternative strategies, too...

PS: please reply to one's nodes instead of replying to your own and address your reply to someone else referring to his post...