For those with experience running longer cycles (16 weeks plus) and those with knowledge of them, please respond.

I planned on running my Test C + Deca cycle 16 weeks but have had thoughts of extending it to 20 weeks.

What will be the concern with extending it to 20 weeks?

1. Longer PCT? Will 6 weeks Nolva+Clomid suffice?
2. Longer/Permanent HPTA shutdown? Possible after a 20 week cycle?
3. Can't think of anything else.

Thanks in advance.