https://ec.europa.eu/competition-policy/system/files/2021-02/merger_control_procedures_en.pdf
Timing
From the opening of a Phase II investigation, the Commission has 90 working days to make a final decision on the compatibility of the planned transaction with the EU Merger Regulation. This can be extended by an additional 15 working days if the notifying parties offer commitments later in phase II (i.e. after the 55th working day of the case). Further extensions of up to 20 working days can be granted on request by, or with the agreement of, the notifying parties. If the notifying parties do not provide an important piece of information which the Commission has requested from them, the clock can be stopped until such missing information is supplied.
The Commission strives to align the timing of the investigations with other authorities worldwide whenever possible. It is cooperating actively with other agencies such as the US Federal Trade Commission and the US Department of Justice.
The final decision
Following the phase II investigation, the Commission may either:
Unconditionally clear the merger; or
Approve the merger subject to remedies; or
Prohibit the merger if no adequate remedies to the competition concerns have been proposed by the merging parties.
All final decisions - in both phase I and phase II - are published on the competition website, after references to the companies' confidential business information has been removed.
Let’s be real, this won’t take a year. I just did a quick search of all deals greater than 10B with EU implications. All had a phase 2 review (44 of them) and only 1 was not approved and that company was sold for parts.