It is quite a climb to get to the top of the Duomo - I cant remember the exact stair count but it probably took about 20-30 minutes. The steps themselves are really worn from centuries of traffic and there are large stretches of stairs without handrails. However, the views from the top of the dome make the climb well worth it. The whole city of Florence is laid out below with red tile roofs stretching for miles and treed mountains surrounding it all. We stood and tried to absorb all of the beauty for at least 45 minutes. If you are physically capable and and in Florence, the views from the top of the Duomo are not to be missed.