You are touching a very subtle and important point, so let’s go step‑by‑step in simple language.

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1. What is happening when samyaktva arises?

Here we are talking about kṣāyopaśamik samyaktva (the usual samyak darshan in the 4th guṇasthān), where:

• Some darśan‑mohaniya karma is destroyed (kṣaya)
• Some is suppressed (upaśama)

So, whenever this samyaktva arises, moha really becomes weaker in that soul. This is a real spiritual change, not imagination.

Because of this:

• Intensity and duration of many karmas decrease
• New heavy mithyātva‑karma is not bound in that period
• The soul’s overall journey toward mokṣa moves forward

This is true every time samyaktva arises, even if it later falls.

You can read a basic explanation of samyak darshan here

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2. “Even 1 second of samyaktva” – does it reduce saṃsāra?

We have to separate two things:

1. Technical scriptural rules

(minimum duration, conditions for “fixed” limit of future births, etc.)

1. General karmic truth

(whenever samyak darshan truly arises, the soul is spiritually benefited.)

(A) Scriptural / technical side

• Jain texts say: the duration of samyak darshan can be “less than a muhūrta” (48 minutes) and also can be infinite.
• For certain promises like “now saṃsāra is limited to a fixed small number of future births”, more conditions are needed – for example:

- the samyak darshan should be of a certain purity, - should remain for some time (at least an antarmuhūrta / muhūrta, etc.), - and should be free from specific defects.

Those are detailed technical points, and different ācāryas explain limits (how many births, in which type of samyaktva) slightly differently.

So:

• Very brief samyaktva may not yet fix a strict, “mathematical” upper limit on total remaining births.
• That stricter guarantee usually assumes more stable, purer samyak darshan.

(B) General karmic truth

However, from the karmic point of view, if genuine kṣāyopaśamik samyaktva arises, then:

• Some mohaniya karma is really destroyed.
• Some is really calmed down.
• New very‑heavy deluding karma (anantānubandhi) is not bound in that period.

Therefore:

> Yes – even the shortest real instance of samyaktva (even less than 1 minute) brings the soul spiritually closer to mokṣa and reduces its total load and intensity of saṃsāra.

The exact numerical limit of future lives may not be fixed yet, but the direction is only forward – the soul can never go back to exactly the old karmic state.

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3. How does samyaktva “shorten” saṃsāra?

In simple language:

1. Before samyaktva

- The soul is in mithyātva (1st–3rd guṇasthān). - Very heavy mohaniya karmas (especially anantānubandhi) are active. - They keep stretching saṃsāra.

1. At samyaktva (4th guṇasthān)

- A portion of these mohaniya karmas is destroyed forever. - A portion is stopped or calmed. - Strong new mithyātva‑karma is not accumulated.

1. Result

- The total “stock” of deluding karma decreases. - The maximum possible length of future wandering becomes less than before.

So every genuine rise of samyaktva cuts off part of the chain of future saṃsāra.

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4. How can kṣāyopaśamik samyaktva be lost and regained many times?

The basic picture (with guṇasthān)

• 1st–3rd guṇasthān: states of mithyātva (wrong faith).
• 4th guṇasthān: samyak darshan (kṣāyopaśamik samyaktva in most cases).

Because the mohaniya karma is only partly destroyed and partly suppressed, it can:

• Re‑rise (udaya) and overpower faith again →

the soul falls back to 1st–3rd guṇasthān (mithyātva).

• Later, due to punya, satsang, internal effort, etc.,

that mithyātva again becomes weak / suppressed, and partial destruction occurs → samyaktva arises again, soul returns to 4th guṇasthān.

This up‑down movement can happen many times within the same birth:

• Each time samyaktva arises:

- some more moha is cut, - some more karmas’ duration / intensity is reduced, - saṃsāra becomes shorter than before.

• Each fall into mithyātva is harmful, no doubt;

but even then, the moha already destroyed in earlier samyaktva never comes back.

So, the graph of the soul is not a flat line; it is more like:

> up (samyaktva) → some fall → again up → again fall → … > but net trend, through many lives, is toward less moha and nearer mokṣa, > especially in a bhavya soul.

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5. Digambar / Śvetāmbara notes

• Both traditions accept:

- samyak darshan arising due to kṣaya, upaśama, or kṣāyopaśama of darśan‑mohaniya karma, - its association with the 4th guṇasthān, - the possibility of falling from and regaining samyaktva multiple times.

• They may differ in technical classification details and some numerical limits of future births,

but the core idea is the same: - Every true samyaktva weakens moha, reduces saṃsāra, and can be lost and regained until it becomes fully kṣāyik and irreversible.

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In essence

• Yes, even the briefest real kṣāyopaśamik samyaktva reduces deluding karma and moves the soul closer to mokṣa.
• No, such an instant may not always satisfy the technical conditions for:

“Now saṃsāra is definitely limited to exactly so‑many future lives.”

• Kṣāyopaśamik samyaktva can arise and fall many times in one birth,

and each rise is a real, irreversible gain in the long journey, even if, externally, the person looks like they are going up and down.