My husband and I will be flying into Dublin to start our trip. We arrive late on a Thursday (early April)and will be going straight to the hotel. How many days should we spend in Dublin? My husband is thinking Friday and Saturday but I am not sure. Ecluding travel days we only have 6 full days to see the sights.

You could spend all your six days in and around Dublin, with plenty to see and do.

The best answer to your question depends on what you mean by "see the sights". What are your interests and your expectations?