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water heater with broken dip tube

what is a sign that when a 50 gallon gas water heater has a broken dip tube, how long normally does it take to run out of hot water? Is it instantly, after 5 minutes, or shorter? thanks to all.
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Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
How many minutes of hot water depends on the faucet. Big high flow tub fillers can drain 50 gallons in 5 minutes or so.
A typical 2.5 gpm shower head should give you 15- 20 minutes depending on how hot you have the tank set.
trainer for Caleffi NA
Living the hydronic dream
With my 50 gallon gas heater I can easily take a hot 40 minute shower followed by the wife having her usual shower, no issues. I run the heater around 140F.
In an apartment we had, it had a 40 gallon heater, yes it was smaller, but I couldn't get more than one 15 minute shower out of it, and I had it cranked up to 150-160F. After 15 minutes we were talking luke warm at best and it ended up cold fast. As soon as you felt the temperature drop it meant you needed to get the soap off you ASAP.
I'm pretty sure the heater in the apartment needed a dip tube as we had the same symptoms from an AO Smith heater at my parents house in the 90s that had a dip tube issue.
It's inside the tank?
Seems like all that hole would do is help in bleeding air out of the tank when it's first filled, but after that, nothing?
Also, if the dip tube was broken off, it could give all kinds of different amounts of hot water usage, depending on how far down it was broken off. The only way to tell for sure is to pull it out and check it.
Rick
40 minute shower????
really
Need to know
tank temperature
shower temperature
incoming cold temperature
burner size of the tank
to get a number using math
I've heard numbers like 87% of the tank capacity of 120° is available for a shower so for a 50 gallon tank 43 gallons or minutes at 1 gpm flow
trainer for Caleffi NA
Living the hydronic dream
Some times with single handle faucets you can get a cross connection letting cold water into the hot water lines.
get a laser didital temp gun turn on the shower faucet and let it run and put it on the hot water outlet pipe see if the water temp goes down or if the temp stays up and the shower water still runs cold. If this happens you have a cross connection.