How long before bed for 2nd session?

My TM teacher instructed me 6-6 and a half hours between the two sessions and 2nd session should be around 6 hours before bed.

Do you guys break this limit? Lately I’ve been sadly not able to do my evening session at the proper time so I do it a little late just to keep the discipline of twice a day, and sleep 1-3 hours after. Is this fine or no?