If even head movement is impossible, prayer is not performed by eye, eyebrow or heart gestures.
The source records a juristic discussion about delay. The adopted fatwa described in the commentary is:
• if this total incapacity covers more than 5 obligatory prayers, the corresponding Qada is not required;
• if it covers 5 or fewer, the missed prayers are made up when ability returns.
The exact threshold is more than 5 prayers — not a vague 'more than one day' rule.