A shower seal takes about 4 hours, with an extra hour or two if your shower screen needs to be removed and refitted.
A complete retile takes a week because the process involves 5 days of demolition, waterproofing, screeding, tiling, grouting & sealing, each needs a day for curing & resting before commencing the next stage.
Balcony repairs are double this time due to their size and are also subject to delays when it rains.