Does lengthy refrigerant line between indoor and outdoor unit affect AC performance and result in higher utility bill?
Each manufacturer has installation recommendations for their equipment, including distance, vertical height difference, size of line, etc. I’d follow their directions.
30’ does not seem unreasonable for total length, including distance plus height. See Trane’s installation guide starting on page 18-21.
https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/split-systems/odyssey-6-to-25-tons/SSP-SVX14J-EN_07112018.pdf
Obviously when you push the limits of their recommendations, the efficiency will go down.