maybe like this?
| makeresults count=1
| eval data = "DT=2018-11-06T11:31:08.844-0800|LogId=TxLog||ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Request Received;;;
DT=2018-11-06T11:31:08.846-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904;;;
DT=2018-11-06T11:31:08.846-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIISPJ;;;
DT=2018-11-06T11:31:08.961-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIISPJ|Elapsed=115;;;
DT=2018-11-06T11:31:08.962-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904;;;
DT=2018-11-06T11:31:08.962-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904;;;
DT=2018-11-06T11:31:08.965-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIMSPA;;;
DT=2018-11-06T11:31:08.966-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIBSP;;;
DT=2018-11-06T11:31:09.078-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIBSP|Elapsed=110;;;
DT=2018-11-06T11:31:09.079-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIMSPA|Elapsed=113;;;
DT=2018-11-06T11:31:09.080-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIYSPB;;;
DT=2018-11-06T11:31:09.192-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIYSPB|Elapsed=112;;;
DT=2018-11-06T11:31:09.193-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Request Sent|DestId=CWS_DIRECT_TLS|MsgNm=/CWSDIRECT/Restraints/DebitCardDetail;;;
DT=2018-11-06T11:31:09.257-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904;;;
DT=2018-11-06T11:31:09.258-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Response Received|DestId=CWS_DIRECT_TLS|MsgNm=/CWSDIRECT/Restraints/DebitCardDetail|Elapsed=64;;;
DT=2018-11-06T11:31:09.259-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904;;;
DT=2018-11-06T11:31:09.262-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904;;;
DT=2018-11-06T11:31:09.263-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28904|TxAct=Response Sent|Elapsed=421;;;
DT=2018-11-06T11:32:08.844-0800|LogId=TxLog||ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Request Received;;;
DT=2018-11-06T11:32:08.846-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905;;;
DT=2018-11-06T11:32:08.846-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef289045TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIISPJ;;;
DT=2018-11-06T11:32:08.961-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIISPJ|Elapsed=115;;;
DT=2018-11-06T11:32:08.962-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905;;;
DT=2018-11-06T11:32:08.962-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905;;;
DT=2018-11-06T11:32:08.965-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIMSPA;;;
DT=2018-11-06T11:32:08.966-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIBSP;;;
DT=2018-11-06T11:32:09.078-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIBSP|Elapsed=110;;;
DT=2018-11-06T11:32:09.079-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIMSPA|Elapsed=113;;;
DT=2018-11-06T11:32:09.080-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Request Sent|DestId=PI_DB2|MsgNm=PIIYSPB;;;
DT=2018-11-06T11:32:09.192-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Response Received|DestId=PI_DB2|MsgNm=PIIYSPB|Elapsed=112;;;
DT=2018-11-06T11:32:09.193-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Request Sent|DestId=CWS_DIRECT_TLS|MsgNm=/CWSDIRECT/Restraints/DebitCardDetail;;;
DT=2018-11-06T11:32:09.257-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905;;;
DT=2018-11-06T11:32:09.258-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Response Received|DestId=CWS_DIRECT_TLS|MsgNm=/CWSDIRECT/Restraints/DebitCardDetail|Elapsed=64;;;
DT=2018-11-06T11:32:09.259-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905;;;
DT=2018-11-06T11:32:09.262-0800|LogId=AppLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905;;;
DT=2018-11-06T11:33:09.263-0800|LogId=TxLog|ProcId=4e66cc75-fe14-4d23-9406-065c7ef28905|TxAct=Response Sent|Elapsed=421"
| makemv delim=";;;" data
| mvexpand data
| rename data as _raw
| extract
| eval _time = DT
| rename COMMENT as "the above generates data below is the solution"
| eval start_time = if(TxAct=="Request",_time,null())
| eval sent_time = if(TxAct=="Request Sent",_time,null())
| eval rec_time = if(TxAct=="Response Received",_time,null())
| eval end_time = if(TxAct=="Response Sent",_time,null())
| eventstats values(start_time) as s_t values(end_time) as e_t by ProcId
| eval s_t_epoch = strptime(s_t, "%Y-%m-%dT%H:%M:%S.%3N%z")
| eval e_t_epoch = strptime(e_t, "%Y-%m-%dT%H:%M:%S.%3N%z")
| eval rec_time_epoch = strptime(rec_time, "%Y-%m-%dT%H:%M:%S.%3N%z")
| eval sent_time_epoch = strptime(sent_time, "%Y-%m-%dT%H:%M:%S.%3N%z")
| eval tot_trans_dur_in_sec = e_t_epoch - s_t_epoch
| stats values(*_time_epoch) as *_time_epoch by tot_trans_dur_in_sec ProcId DestId MsgNm
| eval nested_trans_dur_in_sec = rec_time_epoch - sent_time_epoch
| eventstats sum(nested_trans_dur_in_sec) as tot_nested_trans_dur_in_sec by ProcId
added another ProcId and played a little with timestamp
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