Can attachments be removed while waiting for retainers?

I'm on my second to last tray. I was told I would continue to wear the last tray for two months after the two weeks of regular wear before having attachments removed and switch to a retainer. I have over twenty attachments and I hate them. Do the attachments have to stay on for the last two months (!) after the movement should be finished? Is it reasonable to ask that the attachments be removed and to wear the trays as requested without the attachments for the last two months? Thank you!