30 minutes for one engine on Rafale. 1 hour in total.
In case some part of M88 malfunctions, the module that has malfunctioned can be replaced without removing the engine. The AL-31 has to be removed regardless of the reason for malfunction.
The MKI has no advantage in almost anything today. The MKI is not plumbed for drop tanks, so the Rafale still outranges it until drop tanks come in. There is a slight advantage is weapons payload, but that depends on how much range the MKI is willing to sacrifice.
Super Sukhoi may change many things but we have to wait for the specs, that will take years to be released, probably never. We still do not know Mig-29's upgrade specs.
MKI's only real advantage is a more diverse weapons inventory. It is integrated with the Brahmos-A, K-100 and KH-31, all three are unique weapons with no equivalents in the West. Brahmos-M can solve that problem for Rafale, but we cannot yet be sure about the other two weapons.