A province is eligible to begin the process once it: is a core, is part of a state (not a territory), has no nationalism, has local autonomy of less than 50%, and borders EITHER at least one of your provinces that has your primary culture or at least one of your provinces that has a 'hybridized' culture.

At the first stage the province must not be your primary culture and must NOT have a corresponding province modifier assigned by the mod (meaning it hasn't been 'Ottomanized').
At the second stage the province must not be your primary culture and must HAVE the corresponding province modifier assigned by the mod (it is 'Ottomanized').

'Hybridized' culture can spread if a neighboring province is the owner's culture or has a 'hybridized' culture even if the neighboring 'hybridized' culture is not the same as the province's hybridized culture. (ie a Serbian province is elgibile for conversion to 'Ottomanized' Serbian if it neighbors an 'Ottomanized' Bulgarian province)

From that point an event will fire with a Mean-Time-To-Happen (which is just Paradox’s way of saying average time it takes an event to happen) of 960 months. This is modified by a number of factors. The total MTTH is a combination of all the factors which are active. This means that the total MTTH can be affected by multiple positive and negative effects which all stack.

Factors which decrease the time it takes for event to fire (make it easier) are expressed as decimal values below 1, indicating they are make the event fire that much faster.
Factors as follows:
• Has owner accepted culture (.8)
• Is part of owner culture group (.8)
• Is part of owner super culture (.9) (Super cultures are mod identified groupings: western european, eastern european, middle eastern, altaic, african, east asian, SE asian, indian, etc)
• Is part of a neighbooring super culture (.95) (for example states that are part of the east European super culture will get bonus to convert provinces with cultures from West European, Middle Eastern and Alatic super cultures)
• All neighboring provinces have primary culture (.5)
• All neighboring provinces have primary culture or hybridized culture (.75)
• Located in same Area as country’s capital (.85)
• All ideas, national ideas and policies that affect culture conversion speed and accepted culture threshold have corresponding modifiers in OCT. For example if the idea gives a bonus of 20% in culture conversion speed then the mod registers a change of .8 in spread. This includes all ideas, national ideas and policies in the mods The Idea Variation and Extended Timeline
• State religious tolerance towards religion in province (tolerance 2-4 (.9), tolerance 4-6 (.8), etc)
• Religion in province is not state religion but is part of state religion group (.9) (Orthodox province when owner is Catholic)
• High stability (stability 3 (.9), stability 2 (.95))
• High prestige (prestige 100 (.8), prestige 90 (.85), etc)
• Is a coastal province (.8)
• Trade buildings (scaled - market (.95), depot (.96), stock exchange (.98))
• University building (.9)
• Government Type (administrative monarchy, absolute monarchy, theocracy, english monarchy, elective monarchy (0.95), constitutional monarchy, enlightened absolutism, revolutionary empire, republic, celestial empire (.9))

Factors which increase the time it takes for event to fire (make it harder) are expressed as decimal values above 1, indicating they are make the event fire that much slower.
Factors as follows:
• Local autonomy (autonomy 5-10 (1.05), autonomy 20-30 (1.2), etc)
• Local culture from a different culture group then primary (1.2)
• Does not follow state religion (1.2)
• Province development (development 10-20 (1.1), development 20-30 (1.2), etc)
• Terrain (scaled - hills, highlands, savannah, steppe (1.05), jungle, marsh (1.2), glacier, mountain, desert, coastal desert (1.3) )
• Has a regency (1.2)
• Government Type (tribal, siberian council, native (1.4), despotic monarch, feudal monarchy, iqta, daimyo, shogun, steppe horde (1.2))
• Province is part of a trade company (2.5)

In the intermediate stage (‘Ottomanization’) province level modifier bonuses are designed to mitigate the effect of having a non-accepted and non-primary culture in the province. They are divided into two categories which are applied separately. Bonuses for provinces with cultures that are NOT part of a state’s Culture Group are designed to bring the province up to parity with provinces that have cultures that are in a state’s Culture Group. Bonuses for provinces with cultures that are NOT part of a state’s Culture Group are designed to provide an additional bonus. In both cases the bonuses are offset to allow for the positive effect of the Republican Cultural Suffrage bonus and will take the province up to but not over the benefits line intended. In circumstances where a province is not the primary culture but is an accepted culture, it is possible that the province modifier bonus result in a net positive bonuses for the province (even more so than for the nation's primary culture). This is handled via a seperate set of events checks which will remove the bonuses. If that same culture is later reassessed as not longer accepted an event will reassign the bonuses.

For provinces with cultures that are part of a state’s Culture Group the bonuses are:
• local_tax_modifier = 0.05
• local_manpower_modifier = 0.05
• local_sailors_modifier = 0.05

For provinces with cultures that are NOT part of a state’s Culture Group the bonuses are:
• local_tax_modifier = 0.16
• local_manpower_modifier = 0.16
• local_sailors_modifier = 0.16
• local_missionary_strength = 0.01
• local_unrest = -1.5

When a province advances from the first to second stage the province modifer is removed. There are also seperate events which remove the modifier if the province is acquired by another nation.