Assuming this is to be said in an informal way to a friend, most of it is fine. ' at the start of the second part of the sentence. I'd consider having a full stop before this as well.
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Assuming this is to be said in an informal way to a friend, most of it is fine.
The only change I feel is critical is 'It will...' or 'It'll...' at the start of the second part of the sentence. I'd consider having a full stop before this as well.
The final comma would seem more appropriate being a semi-colon.
If this is being written down, numbers up to twenty