How fast can NATO react if an ally is under attack? NATO VJTF forces lead by Turkey help Romania

How fast can NATO react if an ally is under attack? NATO VJTF forces lead by Turkey help repel an attack in Romania
Noble Jump 21 exercise at Cincu firing range in central Romania, part of Steadfast Defender 21 campaign.
The fictitious scenario has Romania attacked by an enemy which captures positions inside the country. As a response, NATO sends the VJTF to provide first response. In this case, a VJTF team lead by the 66th Turkish mechanized infantry brigade
Over 4.000 troops and nearly 600 armored vehicles, machinery, tanks and aircraft are involved in Noble Jump 21. 13 ally countries take part, with troops and equipment directly involved from Turkey, Romania, USA, UK, Italy, Spain, Poland, Latvia, Hungary, Montenegro, Albania, Slovakia.
Troops have been conducting real exercises for over a week and now have put on a life fire show for guests and media. The sequences and timings in this exercise are changed and altered for show mostly, with no real tactical and strategic elements and does not resemble a real live engagement, but it serves for joint communications and live fire action.
00:20 The exercise starts with Turkish and Spanish drones detecting enemy positions. For guest and media visibility, the drones are operating below their normal recon altitude.
01:04 Four sniper teams from the UK, Italy, Spain and Turkey engage targets and move positions.
01:27 Romanian Special Ops Forces engage hostiles near a building.
01:40 Special Ops Forces rappel down from a IAR-330 PUMA Helicopter and storm the building.
02:30 British troops in Jackals take position and engage enemy infantry and vehicles with grenade launchers and machine fire.
03:00 Romania IAR-330 Puma SOCAT attack helicopters are called in to engage enemy artillery positions with unguided rockets.
03:35 Romanian 152mmm howitzers fire on enemy positions.
03:48 US A1M1 Abrams MBTs enter the field, alongside Italian Dardo and Romanian Piranha V IFVs.
04:07 The enemy responds with artillery fire (simulated explosions).
04:28 Romanian IAR-330 Puma SOCAT attack helicopters are called back to provide air support.
04:50 Spanish infantry and ATGM troops take positions on the other flank.
04:59 Tanks and IFVs engage enemy armor and fire upon targets on the battlefield.
05:58 Romanian 152 mm howitzers, Italian 120 mm mortars and Spanish 81 mm mortars fire on enemy positions.
06:50 US Abrams MBTs and Italian Dardo IFVs maneuver, flank the enemy from the east and push remaining enemy units back.
08:58 As the enemy units fall back, infantry secure forward positions.
09:16 Static display shots.