That’s why there are weep holes on the fiberglass shower pans like you have.

The standard WH insulating blankets which are commonly sold in plumbing and hard ware stores are maybe 1" fiberglass with a vinyl jacket.  

I got the inspection report from the last buyer and it says the fiberglass shingle roof is 10-15 years old and that the average life is 18-22 years.That's pretty much it that I can think of.

I like the fiberglass insulation more than the cellulose stuff (recycled newspaper)

Fiberglass should be around 18 inches deep.

2 weeksThat's from the movie Money Pit - you will not get an answer to your question that will encompass every flip, it all depends on what you do and how much you do, I'm a General Contractor and i can give you at least 20 different prices for the same project -  lets say, a bathroom ( most common reno ) -size of bath -  what tub, (steel, cast iron, fiberglass) - or is the bath just a shower, (fiberglass, ceramic tile, marble, are there accent pieces ?)

I have fiberglass blown insulation in my home between floors to dampen sound from a home theater and it helps. 

Many cheap window installers stuff fiberglass insulation or none at all in that small gap, which is a waste of time/money.

Ceiling under roof is blown in, ceiling on fist floor is 30 year old fiberglass.

Garage doors can be aluminum, fiberglass, some form of thermoplastic or wood.