Size of an IDOC

Hi All,

I want to know how much size & memory can be occupied by an IDOC when we triggering an custom IDOC.

In Detail:-

I am execting an custom IDOC from SAP R\3 to SAP XI.

I want to know how much size or memory can be occupied by the system.

Can we take more than 100 fields in an IDOC in different - different segments.

Kindly also suggest me details of payload fields

<SAP:MessageSizePayload>8689</SAP:MessageSizePayload>

<SAP:MessageSizeTotal>24235</SAP:MessageSizeTotal>

<SAP:PayloadSizeRequest>8689</SAP:PayloadSizeRequest>

<SAP:PayloadSizeRequestMap>0</SAP:PayloadSizeRequestMap>

<SAP:PayloadSizeResponse>0</SAP:PayloadSizeResponse>

<SAP:PayloadSizeResponseMap>0</SAP:PayloadSizeResponseMap>

Regards,

Narendra