Is it common to be given 6 months for a minor revision outcome?
I suspect that what happened is that the editor used a web form to notify you of his/her decision, and to send the referee reports. 6 months is probably a default in the software which the editor did not bother to change. The only thing it is likely to indicate is that the editor sees no need to rush you, and is happy to receive your paper when you're ready.

It's certainly a good idea to finish your revisions much more promptly, and it will likely result in your paper being accepted sooner.