Micro-bore or 15 ? If it's 15 . 3 mins a rad. Micro-bore 20 mins. A rad.
Drain down and service boiler at same time
Refill and balance
All in 3 hours
£300 - 400 plus vat.
trust me I can work fast but 3 min to change a rad valves , No . I can not see the point of ding this