Since hydrogen is natural occurring process and chemical you cannot produce hydrogen without there even being a trace of hydrogen already in another substance.
So according to wikipedia here is part of your answer:
H2 is produced in chemistry and Biology laboratories, often as a by-product of other reactions; in industry for the hydrogenation of unsaturated substrates; and in nature as a means of expelling reducing equivalents in biochemical reactions.
LaboratoryIn the laboratory, H2 is usually prepared by the reaction of acids on metals such as zinc with Kipp's apparatus. Zn + 2 H+ → Zn2+ + H2
Aluminium can also produce H2 upon treatment with bases: 2 Al + 6 H2O + 2 OH− → 2 Al(OH)4− + 3 H2
The electrolysis of water is a simple method of producing hydrogen. A low voltage current is run through the water, and gaseous oxygen forms at the anode while gaseous hydrogen forms at the cathode. Typically the cathode is made from platinum or another inert metal when producing hydrogen for storage. If, however, the gas is to be burnt on site, oxygen is desirable to assist the combustion, and so both electrodes would be made from inert metals. (Iron, for instance, would oxidize, and thus decrease the amount of oxygen given off.) The theoretical maximum efficiency (electricity used vs. energetic value of hydrogen produced) is between 80-94%. 2H2O(aq) → 2H2(g) + O2(g)
In 2007, it was discovered that an alloy of aluminum and gallium in pellet form added to water could be used to generate hydrogen. The process also creates alumina, but the expensive gallium, which prevents the formation of an oxide skin on the pellets, can be re-used. This has important potential implications for a hydrogen economy, since hydrogen can be produced on-site and does not need to be transported.
The other part ot your question is: almost instantly when using the methods above
Burn hydrogen
When the atomic nuclei of hydrogen (specifically, hydrogen isotopes like deuterium or tritium) and lithium are fused together under extreme conditions, they can produce helium. This process occurs in stellar environments, such as in stars where fusion reactions take place. Additionally, the fusion of lithium with hydrogen can also produce isotopes of helium, along with other particles like neutrons.
To produce 1 mole of methane (CH4), you need 2 moles of hydrogen (H2). Since 22.4 L of hydrogen is equivalent to 1 mole at standard temperature and pressure (STP), you would need 44.8 L of hydrogen to produce 1 mole of methane. Therefore, to produce 20 L of methane, you would need 896 L of hydrogen.
Sodium reacts with water at room temperature (even at lower ) and produce hydrogen gas , 2Na + 2H2O = 2NaOH + H2
Hydrogen atoms are used to produce helium atoms with larger masses in nuclear fusion. During the fusion process, hydrogen isotopes (such as deuterium and tritium) combine to form helium, releasing vast amounts of energy in the process. Oxygen atoms are not typically involved in nuclear fusion reactions to produce helium.
A long time
No, burning hydrogen produces only water, it does not produce carbon or carbon dioxide.
No. It uses hydrogen during nuclear fusion to produce helium.
Cucumbers typically take about 50 to 70 days to produce after planting the seeds.
A long time
How long did it take to produce frozen the movie
Blackberry bushes typically take about two years to produce fruit after they are planted.
peaplants dont produce fruits they produce vegtables
What plant? the quickest or slowest.
Itreachesmaxsizein10years
6 years
two years the most