grout sealant

How long would it take a Tiler to properly regrout (remove old grout and reapply new grout), as well as remove old silicone and re-silicone within a moderately sized shower enclosure, approx 118cm L x 90cm W x 220 cm H? Pictures also attached. If only a few of the tiles show hairline cracks...

So the tiler finished grouting the other day and I've decided I'm not mad keen on the colour - it's a medium grey (I thought it was much lighter going by the stuff in the bag). I've heard rumours of tinted grout sealant which might kill two birds with one stone - improve the look and protect...

Hi All, I really would appreciate advice on the following; Bathroom was completely stripped back to bare brick. Shower area was created with a small partitioned wall for water pipes to hide behind. Dry lined with water resistant plaster board. Plaster board sealed prior to professional tiler...