Does the Xbox Live to Game Pass Ultimate conversion ratio hold up no matter how much time...

There is no like specific pricing there is a conversion ratio as mentioned:

When you subscribe to Xbox Game Pass Ultimate, we'll convert any prepaid time you have on Xbox Live Gold, Xbox Game Pass, or EA Play subscriptions and apply it toward the Xbox Game Pass Ultimate plan at the current conversion ratio, up to a maximum of 36 months. Prepaid time conversion is final and non-refundable, and ratios are subject to change.
Xbox Live Gold and PC Game Pass conversion ratio: Any remaining time will convert to Xbox Game Pass Ultimate time at a ratio of 3:2 and be rounded up to the next full day. For example, 90 days remaining of Xbox Live Gold or PC Game Pass will convert to 60 days of Xbox Game Pass Ultimate time.
Xbox Game Pass for Console conversion ratio: Any remaining time will convert to Xbox Game Pass Ultimate time at a ratio of 4:3 and be rounded up to the next full day. For example, 90 days remaining of Xbox Game Pass for Console will convert to 68 days of Xbox Game Pass Ultimate time.
EA Play conversion ratio: Any remaining time will convert to Xbox Game Pass Ultimate time at a ratio of 3:1 and be rounded up to the next full day. For example, 90 days remaining of EA Play will convert to 30 days of Xbox Game Pass Ultimate time.

As you can see, you'll now need to purchase around 18 months of Xbox Live Gold to convert it to 12 months of Xbox Game Pass Ultimate, pushing the price to around $120 instead of the previous $60 when using the conversion method.

With the new Xbox Game Pass price increase, the annual subscription costs around $200 if you're paying monthly, so the conversion trick could still save you around $80 or so if that's what you'd prefer to do.
https://support.xbox.com/en-US/help...ss-when-i-sign-up-for-xbox-game-pass-ultimate

https://www.trueachievements.com/n5...an see, you,when using the conversion method.

Thanks,
Mauro

Note: Purchase of Xbox Game Pass Ultimate automatically upgrades your existing Xbox Live Gold or Xbox Game Pass membership(s) to Xbox Game Pass Ultimate at a conversion ratio each based on days remaining.
Learn how this works at www.xbox.com/gamepass. Future code redemptions are also subject to a conversion ratio. Conversion ratio subject to change. All conversions to Xbox Game Pass Ultimate are final: Once converted, you cannot re-convert your Xbox Game Pass
Ultimate membership back to a previous membership. Maximum 36 months of redeemed Xbox Game Pass Ultimate per account at a time, including any converted time from Xbox Live Gold and/or Xbox Game Pass (for PC or console).

Found some more fine print: "Xbox Game Pass Ultimate:

Use your active Xbox Game Pass Ultimate membership to play games on Xbox One and Windows 10 PC. Xbox Game Pass Ultimate includes Xbox Game Pass for Console, Xbox Game Pass for PC, Xbox Live Gold and additional benefits. Note: Purchase of Xbox Game Pass Ultimate
automatically upgrades your existing Xbox Live Gold or Xbox Game Pass membership(s) to Xbox Game Pass Ultimate at a conversion ratio each based on days remaining. Learn how this works at www.xbox.com/gamepass. Future code redemptions are also subject to a
conversion ratio. Conversion ratio subject to change. All conversions to Xbox Game Pass Ultimate are final: Once converted, you cannot re-convert your Xbox Game Pass Ultimate membership back to a previous membership. Maximum 36 months of redeemed Xbox Game
Pass Ultimate per account at a time, including any converted time from Xbox Live Gold and/or Xbox Game Pass (for PC or console). "

Hello!

Purchase of Ultimate plan automatically upgrades your existing Xbox Live Gold or Xbox Game Pass membership(s) to Ultimate at a conversion ratio each based on days remaining. Learn how this works at www.xbox.com/gamepass. Future code redemptions are
also subject to a conversion ratio. Conversion ratio subject to change. All conversions to Ultimate are final: Once converted, you cannot re-convert your Ultimate membership back to a previous membership. Maximum 36 months of redeemed Ultimate per account
at a time, including any converted time from Xbox Live Gold and/or Xbox Game Pass (for PC or console).

https://www.xbox.com/en-US/live/gold/upgrade

Spot on! thanks for your answer!

I fund this shortly after

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When you subscribe to Xbox Game Pass Ultimate, we’ll apply any prepaid time you have on Xbox Live Gold, Xbox Game Pass, or EA Play subscriptions toward the Xbox Game Pass Ultimate plan at the current conversion ratio, up to a maximum of 36 months. Prepaid time conversion is final, and ratios are subject to change.